Add support for building on OSX host on gonk-JB

Change-Id: I9b535235b20075dbe06e42cd04868ca4dbb7363e
Bug 909566 - Remove valgrind from all non nexus-4/jb manifests
Merge pull request #93 from qdot/909566-remove-valgrind-from-ics

Bug 909566 - Remove valgrind from all non nexus-4/jb manifests
Bug 899195 - Add valgrind to jelly bean manifests; r=mwu
use local aosp mirror

Change-Id: I9d43700cff3b1678830adf8c2906748424f17138