Fix palette in 8bit color mode

SourceS/sdl_compat.h

@@ -66,6 +66,11 @@ inline int SDLC_SetSurfaceAndPaletteColors(SDL_Surface *surface, SDL_Palette *pa
 	}
 	if (colors != (palette->colors + firstcolor))
 		SDL_memcpy(palette->colors + firstcolor, colors, ncolors * sizeof(*colors));
+
+	#if SDL1_VIDEO_MODE_BPP == 8
+		// When the video surface is 8bit, we need to set the output pallet as well.
+		SDL_SetColors(SDL_GetVideoSurface(), colors, firstcolor, ncolors);
+	#endif
 	// In SDL1, the surface always has its own distinct palette, so we need to
 	// update it as well.
 	return SDL_SetPalette(surface, SDL_LOGPAL, colors, firstcolor, ncolors) - 1;