Update to SDL 2.24.0 and add separate macOS UB2 dylib

Update mingw and macOS SDL libraries to 2.24.0. (MSVC .lib files and
Xcode project haven't been updated.)

There is now a separate SDL dylib for macOS Universal Binary 1 and 2
because SDL 2.24.0 dropped support for macOS 10.6 (which is last to
support x86). Documentation says SDL 2.24.0 also dropped macOS 10.7
and 10.8 too. So UB2 is now 10.9 or later while 10.5 to 10.8 live in
UB1.

Compiled using osxcross with macOS 11.3 SDK. Ran "strip -x" on Windows
and macOS libraries. Ad-hoc signed dylib using PyOxidizer rcodesign to
fix digest checksums after strip.

code/SDL2/include/SDL_cpuinfo.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -63,6 +63,9 @@ _m_prefetch(void *__P)
 #ifndef __SSE2__
 #define __SSE2__
 #endif
+#ifndef __SSE3__
+#define __SSE3__
+#endif
 #elif defined(__MINGW64_VERSION_MAJOR)
 #include <intrin.h>
 #if !defined(SDL_DISABLE_ARM_NEON_H) && defined(__ARM_NEON)
@@ -76,7 +79,7 @@ _m_prefetch(void *__P)
 #if !defined(SDL_DISABLE_ARM_NEON_H)
 #  if defined(__ARM_NEON)
 #    include <arm_neon.h>
-#  elif defined(__WINDOWS__) || defined(__WINRT__)
+#  elif defined(__WINDOWS__) || defined(__WINRT__) || defined(__GDK__)
 /* Visual Studio doesn't define __ARM_ARCH, but _M_ARM (if set, always 7), and _M_ARM64 (if set, always 1). */
 #    if defined(_M_ARM)
 #      include <armintr.h>
@@ -95,6 +98,14 @@ _m_prefetch(void *__P)
 #if defined(__3dNOW__) && !defined(SDL_DISABLE_MM3DNOW_H)
 #include <mm3dnow.h>
 #endif
+#if defined(__loongarch_sx) && !defined(SDL_DISABLE_LSX_H)
+#include <lsxintrin.h>
+#define __LSX__
+#endif
+#if defined(__loongarch_asx) && !defined(SDL_DISABLE_LASX_H)
+#include <lasxintrin.h>
+#define __LASX__
+#endif
 #if defined(HAVE_IMMINTRIN_H) && !defined(SDL_DISABLE_IMMINTRIN_H)
 #include <immintrin.h>
 #else
@@ -155,6 +166,8 @@ extern DECLSPEC int SDLCALL SDL_GetCPUCacheLineSize(void);
  *
  * \returns SDL_TRUE if the CPU has the RDTSC instruction or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
  * \sa SDL_Has3DNow
  * \sa SDL_HasAltiVec
  * \sa SDL_HasAVX
@@ -176,6 +189,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasRDTSC(void);
  *
  * \returns SDL_TRUE if the CPU has AltiVec features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
  * \sa SDL_Has3DNow
  * \sa SDL_HasAVX
  * \sa SDL_HasAVX2
@@ -196,6 +211,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasAltiVec(void);
  *
  * \returns SDL_TRUE if the CPU has MMX features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
  * \sa SDL_Has3DNow
  * \sa SDL_HasAltiVec
  * \sa SDL_HasAVX
@@ -216,6 +233,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasMMX(void);
  *
  * \returns SDL_TRUE if the CPU has 3DNow! features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
  * \sa SDL_HasAltiVec
  * \sa SDL_HasAVX
  * \sa SDL_HasAVX2
@@ -236,6 +255,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_Has3DNow(void);
  *
  * \returns SDL_TRUE if the CPU has SSE features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
  * \sa SDL_Has3DNow
  * \sa SDL_HasAltiVec
  * \sa SDL_HasAVX
@@ -256,6 +277,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE(void);
  *
  * \returns SDL_TRUE if the CPU has SSE2 features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
  * \sa SDL_Has3DNow
  * \sa SDL_HasAltiVec
  * \sa SDL_HasAVX
@@ -276,6 +299,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE2(void);
  *
  * \returns SDL_TRUE if the CPU has SSE3 features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
  * \sa SDL_Has3DNow
  * \sa SDL_HasAltiVec
  * \sa SDL_HasAVX
@@ -296,6 +321,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE3(void);
  *
  * \returns SDL_TRUE if the CPU has SSE4.1 features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
  * \sa SDL_Has3DNow
  * \sa SDL_HasAltiVec
  * \sa SDL_HasAVX
@@ -316,6 +343,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE41(void);
  *
  * \returns SDL_TRUE if the CPU has SSE4.2 features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
  * \sa SDL_Has3DNow
  * \sa SDL_HasAltiVec
  * \sa SDL_HasAVX
@@ -380,6 +409,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX2(void);
  *
  * \returns SDL_TRUE if the CPU has AVX-512F features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.9.
+ *
  * \sa SDL_HasAVX
  */
 extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX512F(void);
@@ -393,6 +424,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX512F(void);
  *
  * \returns SDL_TRUE if the CPU has ARM SIMD features or SDL_FALSE if not.
  *
+ * \since This function is available since SDL 2.0.12.
+ *
  * \sa SDL_HasNEON
  */
 extern DECLSPEC SDL_bool SDLCALL SDL_HasARMSIMD(void);
@@ -403,13 +436,41 @@ extern DECLSPEC SDL_bool SDLCALL SDL_HasARMSIMD(void);
  * This always returns false on CPUs that aren't using ARM instruction sets.
  *
  * \returns SDL_TRUE if the CPU has ARM NEON features or SDL_FALSE if not.
+ *
+ * \since This function is available since SDL 2.0.6.
  */
 extern DECLSPEC SDL_bool SDLCALL SDL_HasNEON(void);
 
+/**
+ * Determine whether the CPU has LSX (LOONGARCH SIMD) features.
+ *
+ * This always returns false on CPUs that aren't using LOONGARCH instruction
+ * sets.
+ *
+ * \returns SDL_TRUE if the CPU has LOONGARCH LSX features or SDL_FALSE if
+ *          not.
+ *
+ * \since This function is available since SDL 2.24.0.
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_HasLSX(void);
+
+/**
+ * Determine whether the CPU has LASX (LOONGARCH SIMD) features.
+ *
+ * This always returns false on CPUs that aren't using LOONGARCH instruction
+ * sets.
+ *
+ * \returns SDL_TRUE if the CPU has LOONGARCH LASX features or SDL_FALSE if
+ *          not.
+ *
+ * \since This function is available since SDL 2.24.0.
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_HasLASX(void);
+
 /**
  * Get the amount of RAM configured in the system.
  *
- * \returns the amount of RAM configured in the system in MB.
+ * \returns the amount of RAM configured in the system in MiB.
  *
  * \since This function is available since SDL 2.0.1.
  */
@@ -429,6 +490,8 @@ extern DECLSPEC int SDLCALL SDL_GetSystemRAM(void);
  *
  * \returns the alignment in bytes needed for available, known SIMD
  *          instructions.
+ *
+ * \since This function is available since SDL 2.0.10.
  */
 extern DECLSPEC size_t SDLCALL SDL_SIMDGetAlignment(void);
 
@@ -461,9 +524,11 @@ extern DECLSPEC size_t SDLCALL SDL_SIMDGetAlignment(void);
  *
  * \param len The length, in bytes, of the block to allocate. The actual
  *            allocated block might be larger due to padding, etc.
- * \returns a pointer to thenewly-allocated block, NULL if out of memory.
+ * \returns a pointer to the newly-allocated block, NULL if out of memory.
  *
- * \sa SDL_SIMDAlignment
+ * \since This function is available since SDL 2.0.10.
+ *
+ * \sa SDL_SIMDGetAlignment
  * \sa SDL_SIMDRealloc
  * \sa SDL_SIMDFree
  */
@@ -485,7 +550,9 @@ extern DECLSPEC void * SDLCALL SDL_SIMDAlloc(const size_t len);
  *            memory.
  * \returns a pointer to the newly-reallocated block, NULL if out of memory.
  *
- * \sa SDL_SIMDAlignment
+ * \since This function is available since SDL 2.0.14.
+ *
+ * \sa SDL_SIMDGetAlignment
  * \sa SDL_SIMDAlloc
  * \sa SDL_SIMDFree
  */
@@ -508,6 +575,8 @@ extern DECLSPEC void * SDLCALL SDL_SIMDRealloc(void *mem, const size_t len);
  * \param ptr The pointer, returned from SDL_SIMDAlloc or SDL_SIMDRealloc, to
  *            deallocate. NULL is a legal no-op.
  *
+ * \since This function is available since SDL 2.0.10.
+ *
  * \sa SDL_SIMDAlloc
  * \sa SDL_SIMDRealloc
  */