Revert "Refactro Tupfiles"
This reverts commit
cda2107f6e52a3e131502a6ec318ac3f216ac186.
New sub dir: avr.
[libopencm3] Merge remote-tracking branch 'origin/master'
Submodule libopencm3
6246b33..
5bc6bc4
Add non-recursive make system from Andrzej Ostruszka.
Copyright (C) 2012 Andrzej Ostruszka <andrzej.ostruszka@gmail.com>
URL: http://github.com/aostruszka/nonrec-make