[libvirt] [PATCH 00/28] Convert more of configure.ac to use helper macros
This is a follow-on series from
https://www.redhat.com/archives/libvir-list/2013-January/msg00647.html
It converts all the remaining easy library/package checks to
use the new helper macros. What's let are some tricky cases
where we first check via pkg-config and then fallback to a
manual check, or cases where we use a custom pkg-config like
program