removed WinRT support.

src/thread/windows/SDL_sysmutex.c

@@ -44,19 +44,12 @@ SDL_mutex_impl_t SDL_mutex_impl_active = {0};
  * Implementation based on Slim Reader/Writer (SRW) Locks for Win 7 and newer.
  */
 
-#if __WINRT__
-/* Functions are guaranteed to be available */
-#define pReleaseSRWLockExclusive ReleaseSRWLockExclusive
-#define pAcquireSRWLockExclusive AcquireSRWLockExclusive
-#define pTryAcquireSRWLockExclusive TryAcquireSRWLockExclusive
-#else
 typedef VOID(WINAPI *pfnReleaseSRWLockExclusive)(PSRWLOCK);
 typedef VOID(WINAPI *pfnAcquireSRWLockExclusive)(PSRWLOCK);
 typedef BOOLEAN(WINAPI *pfnTryAcquireSRWLockExclusive)(PSRWLOCK);
 static pfnReleaseSRWLockExclusive pReleaseSRWLockExclusive = NULL;
 static pfnAcquireSRWLockExclusive pAcquireSRWLockExclusive = NULL;
 static pfnTryAcquireSRWLockExclusive pTryAcquireSRWLockExclusive = NULL;
-#endif
 
 static SDL_mutex *
 SDL_CreateMutex_srw(void)
@@ -180,11 +173,7 @@ SDL_CreateMutex_cs(void)
     if (mutex) {
         /* Initialize */
         /* On SMP systems, a non-zero spin count generally helps performance */
-#if __WINRT__
-        InitializeCriticalSectionEx(&mutex->cs, 2000, 0);
-#else
         InitializeCriticalSectionAndSpinCount(&mutex->cs, 2000);
-#endif
     } else {
         SDL_OutOfMemory();
     }
@@ -267,10 +256,6 @@ SDL_CreateMutex(void)
         const SDL_mutex_impl_t * impl = &SDL_mutex_impl_cs;
 
         if (!SDL_GetHintBoolean(SDL_HINT_WINDOWS_FORCE_MUTEX_CRITICAL_SECTIONS, SDL_FALSE)) {
-#if __WINRT__
-            /* Link statically on this platform */
-            impl = &SDL_mutex_impl_srw;
-#else
             /* Try faster implementation for Windows 7 and newer */
             HMODULE kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
             if (kernel32) {
@@ -283,7 +268,6 @@ SDL_CreateMutex(void)
                     impl = &SDL_mutex_impl_srw;
                 }
             }
-#endif
         }
 
         /* Copy instead of using pointer to save one level of indirection */