[Libguestfs] [PATCH febootstrap] Some cleanups for Debian and Ubuntu

I just tried to get libguestfs to compile on Ubuntu 11.10 using the latest febootstrap, and the following patches were necessary for me. They are all just reasonable code cleanups *except* for patch 5/5 which is a gross hack for something I don't understand about how Ubuntu 11.10 multiarch support works. Rich.