added UIViewController pointer to SDL_SysWMinfo for iOS

include/SDL_syswm.h

@@ -92,6 +92,7 @@ typedef struct _NSWindow NSWindow;
 #include <UIKit/UIKit.h>
 #else
 typedef struct _UIWindow UIWindow;
+typedef struct _UIViewController UIViewController;
 #endif
 #endif
 
@@ -195,6 +196,7 @@ struct SDL_SysWMinfo
         struct
         {
             UIWindow *window;           /* The UIKit window */
+            UIViewController *viewcontroller;   /* The UIKit view controller */
         } uikit;
 #endif
         /* Can't have an empty union */

src/video/uikit/SDL_uikitwindow.m

@@ -267,10 +267,12 @@ static int SetupWindowData(_THIS, SDL_Window *window, UIWindow *uiwindow, SDL_bo
 UIKit_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info)
 {
     UIWindow *uiwindow = ((SDL_WindowData *) window->driverdata)->uiwindow;
+    UIViewController *uiviewcontroller = ((SDL_WindowData *) window->driverdata)->viewcontroller;
 
     if (info->version.major <= SDL_MAJOR_VERSION) {
         info->subsystem = SDL_SYSWM_UIKIT;
         info->info.uikit.window = uiwindow;
+        info->info.uikit.viewcontroller = uiviewcontroller;
         return SDL_TRUE;
     } else {
         SDL_SetError("Application not compiled with SDL %d.%d\n",