pgsql: In python shlib probe, cater for OpenBSD, which omits the .so sy

In python shlib probe, cater for OpenBSD, which omits the .so symlink.

Most Unix-oid platforms provide a symlink "libfoo.so" -> "libfoo.so.n.n"
to allow the linker to resolve a reference "-lfoo" to a version-numbered
shared library.  OpenBSD has apparently hacked ld(1) to do this internally,
because there are no such symlinks to be found in their library
directories.  Tweak the new code in PGAC_CHECK_PYTHON_EMBED_SETUP to cope.
Per buildfarm member curculio.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/ddd4f82cb6f65354776541dfac3bedf680e0e303

Modified Files
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config/python.m4 | 22 ++++++++++++++++++++--
configure        | 22 ++++++++++++++++++++--
2 files changed, 40 insertions(+), 4 deletions(-)