libarchive patches

[christos%zoulas.com@localhost (Christos Zoulas)]

Hello,

As promised, I've submitted two pull requests for upstream libarchive.
I submitted the second one just today because I was waiting for almost
a month to hear feedback for the first one, and now I've given up waiting.

Here they are:

https://github.com/libarchive/libarchive/pull/1289
https://github.com/libarchive/libarchive/pull/1300

With those two patches the bsdtar program gets feature parity with
our existing pax-as-tar implementation, and can be a drop in
replacement (without needing additional flags).

I would like to commit the changes to our CVS repository, and switch
the default back to libarchive.

Best,

christos