[Libguestfs] hivex: Improvents in building Python bindings

Building against multiple versions of Python is a lot of fun as it is. Add autoconf/automake/libtool (and possible distribution-specific stuff) to the mix and things get really interesting: On Debian and Ubuntu, building against python 3.3 requires an extra include path as documented in <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=692387>. As discussed in <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=692387>, special version- and ABI-specific suffixes have been introduced, those are now part of what is built using libtool. Cheers, -Hilko