[libvirt] [PATCH 0/3] A small example program

The following patches provide a small example program that illustrates how to connect to libvirt, make a few API calls and disconnect. The first patch is my first cut at it with feedback from Rich Jones. The second patch implements feedback from Jim Meyering. The third patch is completely new and implements (I think) integration with the libvirt build tools, so I would appreciate careful examination of what I've done there. Dave