Add prefix to pl/pgsql global variables and functions

Magnus Hagander <magnus@hagander.net>

Commit: 6c90996a4cbfe02639f2ba31d22f9159832de869
Author: Magnus Hagander <magnus@hagander.net>
Date: 2016-03-03T09:45:59Z
Releases: 9.6.0
Add prefix to pl/pgsql global variables and functions

Rename pl/pgsql global variables to always have a plpgsql_ prefix,
so they don't conflict with other shared libraries loaded.

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