Thread: pgsql-server: Add defenses against plpython functions being declared to

Log Message:
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Add defenses against plpython functions being declared to take or return
pseudotypes.  Not sure why I neglected to add these checks at the same
time I added them to the other PLs, but it seems I did.

Modified Files:
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    pgsql-server/src/pl/plpython:
        plpython.c (r1.56 -> r1.57)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/pl/plpython/plpython.c.diff?r1=1.56&r2=1.57)