pgsql: Attempt to get plpython regression tests working again for MSVC

Attempt to get plpython regression tests working again for MSVC builds.

This has probably been broken for quite a long time. Buildfarm member
currawong's current results suggest that it's been broken since 9.1, so
backpatch this to that branch.

This only supports Python 2 - I will handle Python 3 separately, but
this is a fairly simple fix.

Branch
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/179c45ae2fb9519a343bc2e38ebe4609097d14af

Modified Files
--------------
src/tools/msvc/vcregress.pl | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

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