build: make autogen.sh update .git-module-status, as it should

build: make autogen.sh update .git-module-status, as it should

I ran autogen.sh, but then make was always failing like this:

    $ make
    cfg.mk:141: *** gnulib update required; run ./autogen.sh first.  Stop.

Here's the fix:

>From f743f32079fea2e8a17c7f5b59305e584c75dba0 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Fri, 20 Nov 2009 14:29:55 +0100
Subject: [PATCH libguestfs] build: make autogen.sh update .git-module-status, as it should

* autogen.sh: Without this, "make" would always say "gnulib update
required; run ./autogen.sh first", even after you'd run autogen.sh
successfully.