pgsql: Fix MSVC builds for contrib transforms modules.

Fix MSVC builds for contrib transforms modules.

With this patch the MSVC build and installation will work correctly with
the transforms. However the python transform tests for hstore and ltree
are still disabled pending some further adjustments.

Michael Paquier with some tweaks from me.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/cbf9f0ec312e54481e777ffbe941b548d909081e

Modified Files
--------------
src/tools/msvc/Install.pm   |    9 +-
src/tools/msvc/Mkvcbuild.pm |  313 +++++++++++++++++++++++++++----------------
src/tools/msvc/vcregress.pl |   10 +-
3 files changed, 211 insertions(+), 121 deletions(-)