maint.mk: get current gnulib revision correctly.
authorGary V. Vaughan <gary@gnu.org>
Sun, 27 Oct 2013 01:08:08 +0000 (14:08 +1300)
committerGary V. Vaughan <gary@gnu.org>
Sun, 27 Oct 2013 01:08:08 +0000 (14:08 +1300)
* top/maint.mk (gnulib-version): Use git rev-parse to get the
current HEAD revision.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>

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