Added SDL_system.h for the declaration of SDL_iPhoneSetAnimationCallback() and SDL_iPhoneSetEventPump()

src/video/uikit/SDL_uikitevents.m

@@ -24,6 +24,7 @@
 
 #include "../../events/SDL_events_c.h"
 
+#include "SDL_system.h"
 #include "SDL_uikitevents.h"
 #include "SDL_uikitopengles.h"
 #include "SDL_uikitvideo.h"

src/video/uikit/SDL_uikitwindow.m

@@ -22,10 +22,11 @@
 
 #if SDL_VIDEO_DRIVER_UIKIT
 
+#include "SDL_hints.h"
+#include "SDL_mouse.h"
+#include "SDL_system.h"
 #include "SDL_syswm.h"
 #include "SDL_video.h"
-#include "SDL_mouse.h"
-#include "SDL_hints.h"
 #include "../SDL_sysvideo.h"
 #include "../SDL_pixels_c.h"
 #include "../../events/SDL_events_c.h"