First pass at changing SDL 2.0 to SDL 3.0

src/stdlib/SDL_mslibc.c

@@ -39,7 +39,7 @@ __declspec(selectany) int _fltused = 1;
 #endif
 
 /* The optimizer on Visual Studio 2005 and later generates memcpy() and memset() calls.
-   Always provide it for the SDL2 DLL, but skip it when building static lib w/ static runtime. */
+   Always provide it for the SDL3 DLL, but skip it when building static lib w/ static runtime. */
 #if (_MSC_VER >= 1400) && (!defined(_MT) || defined(DLL_EXPORT))
 extern void *memcpy(void* dst, const void* src, size_t len);
 #pragma intrinsic(memcpy)