Fix incorrect make maintainer-clean rule.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/7feecedccef078bb9f39188db2f75c1481b45cc3

Modified Files
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src/backend/Makefile |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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Next:	From: Heikki Linnakangas	Date: 2012-04-08 16:33:18
	Subject: pgsql: Do stack-depth checking in all postmaster children.
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	Subject: pgsql: Further adjustment of comment about qsort_tuple.