pgcrypto: Remove inappropriate const qualifier

The function in question does not in fact ensure that the passed
argument is not changed, and the callers don't care much either.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/652300f5392f2d951b368c38f1cf123003e5e21e

Modified Files
--------------
contrib/pgcrypto/mbuf.c |    2 +-
contrib/pgcrypto/mbuf.h |    2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

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