Fixed a warning when SDL_syswm.h is included in code compiled for iOS with clang.
diff --git a/include/SDL_syswm.h b/include/SDL_syswm.h
index fa11455..2485efb 100644
--- a/include/SDL_syswm.h
+++ b/include/SDL_syswm.h
@@ -163,6 +163,7 @@ struct SDL_SysWMmsg
#if defined(SDL_VIDEO_DRIVER_UIKIT)
struct
{
+ int dummy;
/* No UIKit window events yet */
} uikit;
#endif