Fix bugs in exec.c that prevented pg_upgrade working in Windows.

Backpatch to 9.2 - code before that is quite different and should
not have these defects.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/6259678f8f5443e9d396e20418448b247c6948dd

Modified Files
--------------
contrib/pg_upgrade/exec.c |    8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)

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Next:	From: Tom Lane	Date: 2012-09-03 19:39:45
	Subject: pgsql: Replace memcpy() calls in xlog.c critical sections with structa
Previous:	From: Andrew Dunstan	Date: 2012-09-03 19:33:38
	Subject: pgsql: Fix bugs in exec.c that prevented pg_upgrade working inWindows.