fix up xfs-cmds build after the parallel-fest

fix up xfs-cmds build after the parallel-fest

My big parallel build patch lost the "make configure" target.
This broke Makepkgs...

Now, IMHO, running configure from make is a little bass-ackwards;
I'd probably prefer to have Makepkgs explicitly run:

 autoconf; configure --myoptions; make

but for now, this adds back in a workable "make configure" target.

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>