[armhf] - Builds fail on launchpad

[thopiekar]

As builds were working at the beginning I was wondering why it now fails to build.

As you can see here: https://launchpad.net/~kivy-team/+archive/kivy-daily/+build/4275170
(build log included)

After checking the setup.py for a while I found the reason at
https://github.com/kivy/pyjnius/blob/master/setup.py#L68

Which just cares about i386 and amd64. What about using platform.machine()?
In case of armel and armhf we would need to add a dict to point at the folder "arm", but this isn't really a problem.
Also x86_64 would be needed to be translated to amd64.