error: SDL's allocators now call SDL_OutOfMemory on error.

This means the allocator's caller doesn't need to use SDL_OutOfMemory directly
if the allocation fails.

This applies to the usual allocators: SDL_malloc, SDL_calloc, SDL_realloc
(all of these regardless of if the app supplied a custom allocator or we're
using system malloc() or an internal copy of dlmalloc under the hood),
SDL_aligned_alloc, SDL_small_alloc, SDL_strdup, SDL_asprintf, SDL_wcsdup...
probably others. If it returns something you can pass to SDL_free, it should
work.

The caller might still need to use SDL_OutOfMemory if something that wasn't
SDL allocated the memory: operator new in C++ code, Objective-C's alloc
message, win32 GlobalAlloc, etc.

Fixes #8642.

src/test/SDL_test_common.c

@@ -103,7 +103,6 @@ SDLTest_CommonState *SDLTest_CommonCreateState(char **argv, Uint32 flags)
 
     state = (SDLTest_CommonState *)SDL_calloc(1, sizeof(*state));
     if (!state) {
-        SDL_OutOfMemory();
         return NULL;
     }