Hi.  I'm setting GNU SASL up for git-version-gen and bootstrap, and
noticed that bootstrap doesn't handle git-version-gen well.  See:

jas@latte:~$ cat>configure.ac
AC_INIT([GNU SASL],
        m4_esyscmd([build-aux/git-version-gen .tarball-version]),
        [bug-gsasl@gnu.org],
        [gsasl])
jas@latte:~$ ~/src/gnulib/build-aux/bootstrap 
/home/jas/src/gnulib/build-aux/bootstrap: cannot find package name in configure.ac
jas@latte:~$ 

I'm using the patch below in gsasl, what do you think?

I didn't push the patch without discussion because bootstrap is such a
sensitive script used by many packages.  Maybe someone prefers to fix
the sed expression instead, if we want to support old autoconf without
support for --trace.

/Simon