Fixed building with mingw64
diff --git a/src/render/direct3d11/SDL_render_d3d11.c b/src/render/direct3d11/SDL_render_d3d11.c
index d286be3..5138aa6 100644
--- a/src/render/direct3d11/SDL_render_d3d11.c
+++ b/src/render/direct3d11/SDL_render_d3d11.c
@@ -54,7 +54,11 @@
 #endif  /* __WINRT__ */
 
 
+#ifdef _MSC_VER
 #define SDL_COMPOSE_ERROR(str) __FUNCTION__ ", " str
+#else
+#define SDL_COMPOSE_ERROR(str) SDL_STRINGIFY_ARG(__FUNCTION__) ", " str
+#endif
 
 #define SAFE_RELEASE(X) if ((X)) { IUnknown_Release(SDL_static_cast(IUnknown*, X)); X = NULL; }