Android port improvements.

I don't really meant to commit this just now, but I'm not
sure how my git repository will handle the sourceforge
migration... thank you, sourceforge...

git-svn-id: svn+ssh://svn.code.sf.net/p/yabause/code/trunk@3131 d7be59e3-070e-4b9a-85a1-4646befae34d