Update android target to 16.

Also ignored some more output from ant, as the project already builds.
android: load sdl companion libs.
android: update system settings platform specific.

I hardcoded some paths to external sd, and changed logging facilities. I'm
still not sure why writing the log file failed (segfault in log dtor).
android: only build for armeabi for now
Added support for more formats to sdl_mixer.

I also had to load the dependancies runtime. Even then, it still seems to lack
support for midi, so I kept getting 'unsupported format'. SupSuper suggested
that I could use alternative music assets, which seems to work.