Adjustments for Arch Linux

Modifications necessary to make autosshfs work on Arch Linux.

This version of the code works nicely on my side, but I am not sure if any of the changes will mess up autosshfs on other systems. If so, let me know and I will do my best to help resolving that. It would be nice to have Arch support merged into the main (your) repository.

By the way, there is an Arch package (well, PKGBUILD) for autosshfs now, which fetches the source from my forked repo at the moment:
https://aur.archlinux.org/packages/autosshfs-git/
Also, if you are interested, there is a forum thread:
https://bbs.archlinux.org/viewtopic.php?id=163303