MoltenVK support

src/Refresh_Driver_Vulkan.c

@@ -11561,6 +11561,9 @@ static uint8_t VULKAN_INTERNAL_CreateLogicalDevice(
 
 static void VULKAN_INTERNAL_LoadEntryPoints(void)
 {
+	/* Required for MoltenVK support */
+	SDL_setenv("MVK_CONFIG_FULL_IMAGE_VIEW_SWIZZLE", "1", 1);
+
 	/* Load Vulkan entry points */
 	if (SDL_Vulkan_LoadLibrary(NULL) < 0)
 	{