Catch errors in for loop in makefile

Add "|| exit" so that the rule aborts when a command fails.

This is the minimal backpatch version.  The fix in head is more
elaborate.

Branch
------
REL9_0_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/c8c93c6e73b98fc8e0e371a8391d4824732437f2

Modified Files
--------------
src/makefiles/pgxs.mk |   12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)

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Next:	From: Peter Eisentraut	Date: 2011-05-01 22:06:32
	Subject: pgsql: Catch errors in for loop in makefile
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	Subject: pgsql: Make CLUSTER lock the old table's toast table before copyingdat