Enable compiler optimization on all macOS architectures

It seems to improve framerate and still work on x86 and x86_64. I
haven't tested ppc64 as I don't have the hardware. ppc64 isn't built
into the universal bundle either.

I noticed this because compiling opus warns it may be slow due to
optimization being disabled.

Makefile

@@ -419,7 +419,7 @@ ifeq ($(PLATFORM),darwin)
   LIBS = -framework Cocoa
   CLIENT_LIBS=
   RENDERER_LIBS=
-  OPTIMIZEVM=
+  OPTIMIZEVM = -O3
 
   # Default minimum Mac OS X version
   ifeq ($(MACOSX_VERSION_MIN),)
@@ -435,7 +435,6 @@ ifeq ($(PLATFORM),darwin)
 
   ifeq ($(ARCH),ppc)
     BASE_CFLAGS += -arch ppc -faltivec
-    OPTIMIZEVM += -O3
   endif
   ifeq ($(ARCH),ppc64)
     BASE_CFLAGS += -arch ppc64 -faltivec

make-macosx-ub.sh

@@ -19,7 +19,7 @@ unset X86_64_MACOSX_VERSION_MIN
 unset X86_SDK
 unset X86_CFLAGS
 unset X86_MACOSX_VERSION_MIN
-unset PPC_64_SDK
+unset PPC_SDK
 unset PPC_CFLAGS
 unset PPC_MACOSX_VERSION_MIN