fix mixing up of SDL and libc allocators, proper flushing of quad build buffers

apps/demos/bunnymark/game.c

@@ -66,7 +66,7 @@ void game_tick(void)
     { // First tick, initalizing data
         // Allocating State struct to store data there
         if (!ctx.udata)
-            ctx.udata = ccalloc(1, sizeof(State));
+            ctx.udata = calloc(1, sizeof(State));
     }
 
     input_action("add_a_bit", CONTROL_LEFT_MOUSE);