Fixed warning.

3rdparty/stb/stb_rect_pack.h

@@ -2,6 +2,8 @@
 #	pragma GCC diagnostic ignored "-Wtype-limits"
 #	pragma GCC diagnostic ignored "-Wunused-function"
 #	pragma GCC diagnostic ignored "-Wunused-parameter"
+#else
+#	pragma warning(disable:4100) // C4100: 'c': unreferenced formal parameter
 #endif
 
 // stb_rect_pack.h - v0.08 - public domain - rectangle packing