Bunch of commits that resolves posted Issues and more

This pull request contains following commits:
1) Update to arm stable mesa with optional 'opengl' flag as was done before.
2) sunxi-tools libusb dependency (Issue#4)
3) libUMP static libs and .la files (Issue#5)
4) fbturbo ebuild modification, that simplifies it and takes care of .la fiels (Issue#5).