Bug 833627 - Reject gcc < 4.4, and remove a few unused Xcode related variables. r=ted
Bug 833253 - Don't rely on eval during recursive expansion for nsinstall_is_usable. r=ted
Bug 833627 - Change the gcc < 4.4 rejection error text in main configure.in to match js/src/configure.in's. DONTBUILD. r=ted

The change was unfortunately not committed at the time of landing.