Update stb_library.hpp

Author: allnes

3rdparty/stb_library.hpp

@@ -1,7 +1,13 @@
 #pragma once
 
+#if defined(__clang__)
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wcast-align"
+#endif
+
 #define STB_IMAGE_IMPLEMENTATION
 #include <stb/stb_image.h>
+
+#if defined(__clang__)
 #pragma clang diagnostic pop
+#endif