Make sure sharedir/extension/ directory is created when needed.

The previous coding worked as long as MODULEDIR wasn't set explicitly,
because we create sharedir/$(datamoduledir) and the default value of
that is "extension".  But if some other value is specified for MODULEDIR
then the installation directory needed for the control file wasn't made.

Cédric Villemain

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/b1346822f3048ede254647f3a46186e4c0ec68d6

Modified Files
--------------
src/makefiles/pgxs.mk |    3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

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