Set SDL2 app name hint

https://git.do.srb2.org/STJr/SRB2/-/merge_requests/2697

src/sdl/i_system.cpp

@@ -1873,6 +1873,9 @@ INT32 I_StartupSystem(void)
 	 SDLcompiled.major, SDLcompiled.minor, SDLcompiled.patch);
 	I_OutputMsg("Linked with SDL version: %d.%d.%d\n",
 	 SDLlinked.major, SDLlinked.minor, SDLlinked.patch);
+#if SDL_VERSION_ATLEAST(2,0,22)
+	SDL_SetHint(SDL_HINT_APP_NAME, "BlanKart");
+#endif
 	if (SDL_Init(0) < 0)
 		I_Error("SRB2Kart: SDL System Error: %s", SDL_GetError()); //Alam: Oh no....
 #ifndef NOMUMBLE