Configure buildbot for 32bit builder.
https://bugs.webkit.org/show_bug.cgi?id=115769
        
Reviewed by Ryosuke Niwa.

* BuildSlaveSupport/build.webkit.org-config/config.json:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149752 268f45cc-cd09-0410-ab3c-d52691b4dbfc