backout - build: mozilla: mac: allow use of jemalloc again
http://bugs.activestate.com/show_bug.cgi?id=95983

(integrated from komodo (trunk) change 80950 by toddw)

git-svn-id: https://svn.openkomodo.com/repos/openkomodo/trunk@13265 b87d16e7-d29f-4ee1-b5ec-817d645d335f