In pg_upgrade, remove dependency on pg_config, as that might not be in
the non-development install.  Instead, use the LOAD mechanism to check
for the pg_upgrade_support shared object, like we do for other shared
object checks.

Backpatch to 9.1.

Report from Àlvaro

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/02b183acb42831bbeba819fde568263f19f2acdc

Modified Files
--------------
contrib/pg_upgrade/check.c    |   42 -----------------------------------------
contrib/pg_upgrade/function.c |   15 ++++++++++---
2 files changed, 11 insertions(+), 46 deletions(-)

pgsql-committers by date

Next:	From: Alvaro Herrera	Date: 2012-03-19 20:39:24
	Subject: pgsql: plperl: Package-qualify _TD
Previous:	From: Andrew Dunstan	Date: 2012-03-17 21:31:05
	Subject: pgsql: Honor inputdir and outputdir when converting regression files.