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
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/f3d7077dad94d6ac864647eaa50f5dd0590a6c8d

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

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