iOS: return SDL_GetWindowSize from SDL_GL_GetDrawableSize if there's no GLES view in the window (matches the behaviour of SDL_GL_GetDrawableSize on other platforms). Addresses bug #4629.
diff --git a/src/video/uikit/SDL_uikitopengles.m b/src/video/uikit/SDL_uikitopengles.m
index ef6275f..68d8f1d 100644
--- a/src/video/uikit/SDL_uikitopengles.m
+++ b/src/video/uikit/SDL_uikitopengles.m
@@ -96,6 +96,8 @@
             if (h) {
                 *h = glview.backingHeight;
             }
+        } else {
+            SDL_GetWindowSize(window, w, h);
         }
     }
 }