add mega client
meaga app: https://github.com/meganz/android
I've been trying to get the developer to add a branch for f-droid: https://github.com/meganz/android/pull/9
but i think they will not take care about this. So this build script will remove all the nonfree stuff by itself. I just not 100% percent sure if all the libs used to build the native part are free, but it seems so (a check would not be bad).