update SDL soruce to 2.0.14

Edward Rudd

2021-06-15 dec7875a6e23212021e4d9080330a42832dfe02a

 source/src/thread/generic/SDL_systhread.c

@@ -27,12 +27,12 @@

#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
int
SDL_SYS_CreateThread(SDL_Thread * thread, void *args,
SDL_SYS_CreateThread(SDL_Thread * thread,
                     pfnSDL_CurrentBeginThread pfnBeginThread,
                     pfnSDL_CurrentEndThread pfnEndThread)
#else
int
SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
SDL_SYS_CreateThread(SDL_Thread * thread)
#endif /* SDL_PASSED_BEGINTHREAD_ENDTHREAD */
{
    return SDL_SetError("Threads are not supported on this platform");