pgbuildfarm - client-code: can't run cvs status if we are in export

Log Message:
-----------

can't run cvs status if we are in export mode - so in that case we
just won't report the versions - everyone should be using update anyway.

Modified Files:
--------------
client-code:
run_build.pl (r1.22 -> r1.23)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbuildfarm/client-code/run_build.pl.diff?r1=1.22&r2=1.23)