Make the Rakefile look for multiple .c files to compile.
Make the Rakefile look for multiple .c files to compile.

This will be needed by the rest of this series of patches.

Signed-off-by: Chris Lalancette <60b62644009db6b194cc0445b64e9b27bb26433a@redhat.com>

klynch/ruby-libvirt,klynch/ruby-libvirt,klynch/ruby-libvirt