- mozilla don't do real releases anymore from xulrunner itself, so build
it from firefox 3.6.3 tarball. Thx tnn@netbsd for the trick.
- that also permits us to use patches/ and files/ from
www/mozilla-firefox, and stop mirroring another 50Mb distfile. Yay!
- some headers are MI, so do the PFRAG.{amd64,jit}-devel dance in PLIST
sthen@ thinks 'going in this direction makes a lot of sense'.