Request for help: Fix building tarballs for ports add-on.

[Roland McGrath]

I've been thinking that right after 2.16 will be a good time to consolidate
the repositories (just the initial step, making it ports/ under the libc
tree).  So there might not be very many more iterations of doing this,
though I guess 2.16.x could easily have a substantial upper bound for x.
That said, automation ought to be well nigh trivial.  Unless I've forgotten
about something, we're just doing git archive | compressor-of-choice.


Thanks,
Roland