Fixed bug 5497 - SDL_COMPOSE_ERROR is wrong

UMU

#define SDL_COMPOSE_ERROR(str) SDL_STRINGIFY_ARG(__FUNCTION__) ", " str

I think SDL_STRINGIFY_ARG should be removed.

#define SDL_COMPOSE_ERROR(str) __FUNCTION__ ", " str

(verified with Visual Studio 2019)

src/render/direct3d11/SDL_render_d3d11.c

@@ -54,7 +54,7 @@ extern ISwapChainBackgroundPanelNative * WINRT_GlobalSwapChainBackgroundPanelNat
 #endif  /* __WINRT__ */
 
 
-#define SDL_COMPOSE_ERROR(str) SDL_STRINGIFY_ARG(__FUNCTION__) ", " str
+#define SDL_COMPOSE_ERROR(str) __FUNCTION__ ", " str
 
 #define SAFE_RELEASE(X) if ((X)) { IUnknown_Release(SDL_static_cast(IUnknown*, X)); X = NULL; }