Before making top-level traverse js/src moz.build files, there was a need to
distinguish between top-level traversing e.g. top-level moz.build or
config/moz.build and js/src traversing them. With a single traversal of both
moz.build sets, we now only need to distinguish between js standalone builds
and gecko builds.
There is still, however, a need to distinguish between top-level vs. js/src
configure runs on gecko builds to make them subconfigure icu and libffi from
top-level instead of js/src in js standalone builds, or when choosing to make
js/src's config.status do something when run or not.
Before, we would run configure in both top-level and js/src, and both
configures would traverse their own set of moz.builds, without actual
knowledge about the other. With this change, both configures still run,
but only top-level traverses moz.build files, and uses js/src's
config.status when traversing its moz.build files. This allows a better
sharing of information between both build systems and the removal of many
hacks.
This also moves running libffi and icu configure to top-level.
Standalone js builds still have their own configure doing moz.build traversal,
as before.
--HG--
rename : config/autoconf.mk.in => config/autoconf-js.mk.in
rename : config/emptyvars.mk.in => config/emptyvars-js.mk.in
