Bug 1094521 - Rewrite export rules in toolkit/mozapps/update/updater/Makefile.in to not regenerate files every time. r=mshal
Bug 1094566 - Do not overwrite buildid on the compilation phase of PGO builds. r=mshal
Bug 1094584 - Stop using the fake.lib trick. r=mshal

This used to be necessary to avoid the conflicting names between import
libraries and static libraries, but that's now prevented by the whole
moz.build machinery.
Bug 1094624 - Resist to more multiprocessing problems in build/subconfigure.py. r=gps,a=kwierso