Android makefile

The code compiles nicely with the Android NDK using gcc 4.8 (though I have a lot of coding to do until I'm able to actually run anything, so I can't comment on that yet). This is the Android makefile I used, cleaned up a bit for easier use.

I guess this might be useful for others so maybe it should be included? A custom Android makefile for Lua is also required, where could that go?

Willi (from the mailing list)