There is a bug with `platform.linux_distribution()`, which returns an
empty value on Archlinux with python2.
This bug is fixed in python3, but *will not* be fixed in python2.
This patch fixes that issue with a dirty hack: on archlinux, there is a
file that can be used to detect an archlinux machine. that file is
`/etc/arch-release`. if the file exists, then the OS variable will be
set to "linux-arch".
You can learn more about that issue on the python bug platform:
https://bugs.python.org/issue20454
Signed-off-by: Philippe Loctaux <loctauxphilippe@gmail.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
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