Revert "build: use autobuild module to make build logs nicer"

This reverts commit 83aca30f.

While the motivation of the original commit is fine, we are intending to
drop autoconf in favour of meson, and similarly wish to drop use of
gnulib. Removing this feature is part of that conversion work.
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

bootstrap.conf

@@ -20,7 +20,6 @@
 gnulib_modules='
 accept
 areadlink
-autobuild
 base64
 bind
 bitrotate

configure.ac

@@ -123,12 +123,6 @@ AC_PROG_CC
 AC_PROG_INSTALL
 AC_PROG_CPP
 
-dnl Setting AB_VERSION makes the 'autobuild' lines of configure output
-dnl slightly more useful
-if test -d $srcdir/.git && git --version >/dev/null 2>&1 ; then
-  AB_VERSION=`cd $srcdir && git describe --match 'v[[0-9]]*' 2>/dev/null`
-fi
-
 dnl autoconf 2.70 adds a --runstatedir option so that downstreams
 dnl can point to /run instead of the historic /var/run, but
 dnl autoconf hasn't had a release since 2012.