Adjust configure's probe for libselinux so it rejects too-old versions.

We need at least version 2.0.93, so probe for a function that was added
in that version.

Kaigai Kohei

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/8ff1f6a78c4fb48337f671f1586839cef5d4b940

Modified Files
--------------
configure    |   24 ++++++++++++------------
configure.in |    4 ++--
2 files changed, 14 insertions(+), 14 deletions(-)

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