Fix parallel gmake for extension directory addition in PL languages.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/c15c1f1c15fc19d20c0699aeb312664f5529c87a

Modified Files
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src/pl/plperl/GNUmakefile   |    4 ++--
src/pl/plpgsql/src/Makefile |    4 ++--
src/pl/plpython/Makefile    |    4 ++--
src/pl/tcl/Makefile         |    4 ++--
4 files changed, 8 insertions(+), 8 deletions(-)

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