pgsql: Fix shared libpython detection on OS X

Fix shared libpython detection on OS X

Apparently, looking for an appropriately named file doesn't work on some
older versions, so put the back the explicit platform detection.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/010aa420b9dd5393490c8793f43949dca269a753

Modified Files
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configure | 35 ++++++++++++++++++++---------------
configure.in | 35 ++++++++++++++++++++---------------
2 files changed, 40 insertions(+), 30 deletions(-)

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