Wrap attribute in clang check

yoga/YGMacros.h

@@ -47,9 +47,12 @@
 // the header is a mismatch for the Yoga ABI.
 #define YG_ENUM_BEGIN(name) NS_ENUM(int, name)
 #define YG_ENUM_END(name)
-#else
+#elif defined(__clang__)
 #define YG_ENUM_BEGIN(name) enum name
 #define YG_ENUM_END(name) __attribute__((enum_extensibility(closed))) name
+#else
+#define YG_ENUM_BEGIN(name) enum name
+#define YG_ENUM_END(name) name
 #endif
 
 #ifdef __cplusplus