removed WinRT support.

src/loadso/windows/SDL_sysloadso.c

@@ -40,15 +40,7 @@ SDL_LoadObject(const char *sofile)
         return NULL;
     }
     tstr = WIN_UTF8ToString(sofile);
-#ifdef __WINRT__
-    /* WinRT only publicly supports LoadPackagedLibrary() for loading .dll
-       files.  LoadLibrary() is a private API, and not available for apps
-       (that can be published to MS' Windows Store.)
-    */
-    handle = (void *) LoadPackagedLibrary(tstr, 0);
-#else
     handle = (void *) LoadLibrary(tstr);
-#endif
     SDL_free(tstr);
 
     /* Generate an error message if all loads failed */