(svn r10216) -Fix: palette animation always redid all palette entries, where in fact only a few indexes were needed

-Codechange: allow blitters to handle palette animation internally or even disable it; 8bpp uses video-backend for palette animation

src/os/macosx/splash.cpp

@@ -128,7 +128,7 @@ void DisplaySplashImage()
 	_cur_palette[0xff].b = 0;
 
 	_pal_first_dirty = 0;
-	_pal_last_dirty = 0xff;
+	_pal_count_dirty = 255;
 
 	png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
 	fclose(f);