pgbuildfarm - client-code: use new extra_config setting on temp regress

Log Message:
-----------
use new extra_config setting on temp regress installation.

Modified Files:
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client-code:
build-farm.conf (r1.26 -> r1.27)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbuildfarm/client-code/build-farm.conf.diff?r1=1.26&r2=1.27)
run_build.pl (r1.87 -> r1.88)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbuildfarm/client-code/run_build.pl.diff?r1=1.87&r2=1.88)