Removed UIKit_SetWindowMouseGrab(), mouse grab isn't supported on iOS

src/video/uikit/SDL_uikitvideo.m

@@ -91,7 +91,6 @@ static SDL_VideoDevice *UIKit_CreateDevice(void)
         device->RaiseWindow = UIKit_RaiseWindow;
         device->SetWindowBordered = UIKit_SetWindowBordered;
         device->SetWindowFullscreen = UIKit_SetWindowFullscreen;
-        device->SetWindowMouseGrab = UIKit_SetWindowMouseGrab;
         device->DestroyWindow = UIKit_DestroyWindow;
         device->GetDisplayUsableBounds = UIKit_GetDisplayUsableBounds;
         device->GetWindowSizeInPixels = UIKit_GetWindowSizeInPixels;

src/video/uikit/SDL_uikitwindow.h

@@ -33,7 +33,6 @@ extern void UIKit_HideWindow(SDL_VideoDevice *_this, SDL_Window *window);
 extern void UIKit_RaiseWindow(SDL_VideoDevice *_this, SDL_Window *window);
 extern void UIKit_SetWindowBordered(SDL_VideoDevice *_this, SDL_Window *window, SDL_bool bordered);
 extern int UIKit_SetWindowFullscreen(SDL_VideoDevice *_this, SDL_Window *window, SDL_VideoDisplay *display, SDL_bool fullscreen);
-extern void UIKit_SetWindowMouseGrab(SDL_VideoDevice *_this, SDL_Window *window, SDL_bool grabbed);
 extern void UIKit_UpdatePointerLock(SDL_VideoDevice *_this, SDL_Window *window);
 extern void UIKit_DestroyWindow(SDL_VideoDevice *_this, SDL_Window *window);
 extern void UIKit_GetWindowSizeInPixels(SDL_VideoDevice *_this, SDL_Window *window, int *w, int *h);

src/video/uikit/SDL_uikitwindow.m

@@ -315,11 +315,6 @@ int UIKit_SetWindowFullscreen(SDL_VideoDevice *_this, SDL_Window *window, SDL_Vi
     return 0;
 }
 
-void UIKit_SetWindowMouseGrab(SDL_VideoDevice *_this, SDL_Window *window, SDL_bool grabbed)
-{
-    /* There really isn't a concept of window grab or cursor confinement on iOS */
-}
-
 void UIKit_UpdatePointerLock(SDL_VideoDevice *_this, SDL_Window *window)
 {
 #ifndef SDL_PLATFORM_TVOS