[libvirt] [PATCH] build: change to gnulib module list should rerun bootstrap

[Jim Meyering]

Eric Blake wrote:
> * autogen.sh (curr_status): Also include hash of bootstrap.conf
> when checking for changes that require bootstrap rerun.
> * cfg.mk (_update_required): Likewise.

Good one.
I've pushed it.

FYI, to those following along, this will require that
you rerun ./autogen.sh, which will update the stamp file
to have contents matching the new expected information.