extconf: Always include header name in have_library() calls
extconf: Always include header name in have_library() calls

We do this for the base library, so it only makes sense that we
would do the same for the QEMU-specific and LXC-specific ones
too.

Signed-off-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>

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