pgbuildfarm - client-code: remove effect of inherited LANG and LC_ALL

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

remove effect of inherited LANG and LC_ALL environment values on initdb
for installcheck and contrib-installcheck tests - fixes bug apparently
due to multi-byte strangeness.

Modified Files:
--------------
client-code:
run_build.pl (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbuildfarm/client-code/run_build.pl.diff?r1=1.12&r2=1.13)