Import http://people.mozilla.org/~sstangl/mozjs17.0.0.rc0.tar.gz
build: Add toplevel trampoline configure/Makefile

These just invoke the ones in js/src.
Import http://people.mozilla.org/~sstangl/mozjs17.0.0.rc2.tar.gz
build: Add toplevel trampoline configure/Makefile

These just invoke the ones in js/src.