pgsql: Fix PGXS vpath build when PostgreSQL is built with vpath

Fix PGXS vpath build when PostgreSQL is built with vpath

PGXS computes srcdir from VPATH, PostgreSQL proper computes VPATH from
srcdir, and doing both results in an error from make. Conditionalize so
only one of these takes effect.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/b58233c71b93a32fcab7219585cafc25a27eb769

Modified Files
--------------
src/Makefile.global.in | 3 +++
1 file changed, 3 insertions(+)

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