Log Message:
-----------
Try to unlimit core files if possible, and try to get a gdb backtrace if possible when regression tests fail. None of this fails fatally, so if we can't do it the behaviour is the same as before.
Modified Files:
--------------
client-code:
run_build.pl (r1.72 -> r1.73)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbuildfarm/client-code/run_build.pl.diff?r1=1.72&r2=1.73)