Better check for __has_feature
diff --git a/include/SDL_syswm.h b/include/SDL_syswm.h
index 2f4d5a4..3b5ac50 100644
--- a/include/SDL_syswm.h
+++ b/include/SDL_syswm.h
@@ -208,7 +208,7 @@ struct SDL_SysWMinfo
#if defined(SDL_VIDEO_DRIVER_COCOA)
struct
{
-#if defined(__OBJC__) && defined(__clang__) && __has_feature(objc_arc)
+#if defined(__OBJC__) && defined(__has_feature) && __has_feature(objc_arc)
NSWindow __unsafe_unretained *window; /* The Cocoa window */
#else
NSWindow *window; /* The Cocoa window */
@@ -218,7 +218,7 @@ struct SDL_SysWMinfo
#if defined(SDL_VIDEO_DRIVER_UIKIT)
struct
{
-#if defined(__OBJC__) && defined(__clang__) && __has_feature(objc_arc)
+#if defined(__OBJC__) && defined(__has_feature) && __has_feature(objc_arc)
UIWindow __unsafe_unretained *window; /* The UIKit window */
#else
UIWindow *window; /* The UIKit window */