fix compiler warnings in video/uikit

src/video/uikit/SDL_uikitevents.m

@@ -87,7 +87,7 @@ static id keyboard_disconnect_observer = nil;
 static void OnGCKeyboardConnected(GCKeyboard *keyboard) API_AVAILABLE(macos(11.0), ios(14.0), tvos(14.0))
 {
     keyboard_connected = SDL_TRUE;
-    keyboard.keyboardInput.keyChangedHandler = ^(GCKeyboardInput *keyboard, GCControllerButtonInput *key, GCKeyCode keyCode, BOOL pressed)
+    keyboard.keyboardInput.keyChangedHandler = ^(GCKeyboardInput *kbrd, GCControllerButtonInput *key, GCKeyCode keyCode, BOOL pressed)
     {
         SDL_SendKeyboardKey(pressed ? SDL_PRESSED : SDL_RELEASED, (SDL_Scancode)keyCode);
     };
@@ -225,15 +225,15 @@ static void OnGCMouseConnected(GCMouse *mouse) API_AVAILABLE(macos(11.0), ios(14
     };
 
     int auxiliary_button = SDL_BUTTON_X1;
-    for (GCControllerButtonInput *button in mouse.mouseInput.auxiliaryButtons) {
-        button.pressedChangedHandler = ^(GCControllerButtonInput *button, float value, BOOL pressed)
+    for (GCControllerButtonInput *btn in mouse.mouseInput.auxiliaryButtons) {
+        btn.pressedChangedHandler = ^(GCControllerButtonInput *button, float value, BOOL pressed)
         {
             OnGCMouseButtonChanged(mouseID, auxiliary_button, pressed);
         };
         ++auxiliary_button;
     }
 
-    mouse.mouseInput.mouseMovedHandler = ^(GCMouseInput *mouse, float deltaX, float deltaY)
+    mouse.mouseInput.mouseMovedHandler = ^(GCMouseInput *mouseInput, float deltaX, float deltaY)
     {
         if (SDL_GCMouseRelativeMode()) {
             SDL_SendMouseMotion(SDL_GetMouseFocus(), mouseID, 1, (int)deltaX, -(int)deltaY);

src/video/uikit/SDL_uikitmessagebox.m

@@ -86,7 +86,7 @@ UIKit_ShowMessageBoxAlertController(const SDL_MessageBoxData *messageboxdata, in
 
         action = [UIAlertAction actionWithTitle:@(sdlButton->text)
                                 style:style
-                                handler:^(UIAlertAction *action) {
+                                handler:^(UIAlertAction *alertAction) {
                                     clickedindex = (int)(sdlButton - messageboxdata->buttons);
                                 }];
         [alert addAction:action];

src/video/uikit/SDL_uikitopengles.m

@@ -162,8 +162,8 @@ UIKit_GL_CreateContext(_THIS, SDL_Window * window)
         }
 
         if (_this->gl_config.share_with_current_context) {
-            EAGLContext *context = (__bridge EAGLContext *) SDL_GL_GetCurrentContext();
-            sharegroup = context.sharegroup;
+            EAGLContext *currContext = (__bridge EAGLContext *) SDL_GL_GetCurrentContext();
+            sharegroup = currContext.sharegroup;
         }
 
         if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {