Bug 857628 - Build target programs as position independent executable when supported by gcc/clang. r=mshal
Bug 1072152 - Change chrome.manifest read order. r=bsmedberg

In case of multiple "resource" manifest entries for the same keyword, the
last registered one now takes precedence, like any other chrome manifest
entry.
Bug 837846 - Respect MOZ_MAKE_FLAGS when running make commands from mach. r=mshal