pgsql: Fix parallel make issue with new fmgrprotos.h

Fix parallel make issue with new fmgrprotos.h

The make rules needed further refinement so that we don't run multiple
generations per build.

reported by Tom Lane

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/1a2d9a655a5de1c8c9d479c77d6351b878094606

Modified Files
--------------
src/backend/Makefile | 5 ++++-
src/backend/utils/Makefile | 3 ++-
2 files changed, 6 insertions(+), 2 deletions(-)

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