pgsql: Fix stack clobber in new uuid-ossp code.

Fix stack clobber in new uuid-ossp code.

The V5 (SHA1 hashing) code wrote 20 bytes into a 16-byte local variable.
This had accidentally failed to fail in my testing and Matteo's, but
buildfarm results exposed the problem.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/2103218dd4a0c6a44d05c09c066da20e1c2360fb

Modified Files
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contrib/uuid-ossp/uuid-ossp.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

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