Libvirt dependencies

Hi, these patches are dependencies for libvirt. The libpciaccess and libyajl are real dependencies of libvirt. Util-macros are only a build dependency for libpciaccess thats why are all lines in the rootfile are excluded There are some more dependencies for libvirt (like dmidecode) but libvirt will build and work so far without them, but not without libpciaccess and libyajl.

Regards Jonatan