use system memcpy and memset

code/qcommon/q_shared.h

@@ -237,8 +237,13 @@ void Snd_Memset (void* dest, const int val, const size_t count);
 #define Snd_Memset Com_Memset
 #endif
 
+#if I_WANT_A_CUSTOM_MEMCPY
 void Com_Memset (void* dest, const int val, const size_t count);
 void Com_Memcpy (void* dest, const void* src, const size_t count);
+#else
+#define Com_Memset memset
+#define Com_Memcpy memcpy
+#endif
 
 #define CIN_system	1
 #define CIN_loop	2