Need to backout workaround for RT-14737 in hudson-re-hg-prep.sh

We need to backout the following workaround for RT-14737. The workaround was insufficient and the underlying problem has been fixed.

http://jfxsrc.us.oracle.com/javafx/presidio/MASTER/jfx/rev/9ed4175ca4d2

date: Thu Jul 07 06:54:51 2011 -0700
files: hudson-re-hg-prep.sh
description:
Workaround for RT-14737: manually remove the sdk installer build files to avoid path names that are too long for hg purge