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
------
REL8_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/7b9bbb68e38d9f39ec2b555b0b9aab9e50585c3e

Modified Files
--------------
src/makefiles/pgxs.mk |   10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)

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Next:	From: User Hinoue	Date: 2011-05-02 08:53:37
	Subject: psqlodbc - psqlodbc: Remove a meaningless if clause.
Previous:	From: Peter Eisentraut	Date: 2011-05-01 22:06:31
	Subject: pgsql: Catch errors in for loop in makefile