Adjust dependencies for programs using libarchive
Add xz and linkage against liblzma to rescue system
Approved by: kientzle, delphij (mentor)
MFC after: 2 weeks
copying "dir/file" and then copying "dir" results in
"File on disk is not older; skipping" for the "dir" because
it was implicitly created by "dir/file." Among other sins,
this means that "dir" ends up with the wrong permissions
and ownership.
This is actually a libarchive bug; fix is forthcoming.
A new implementation of cpio that uses libarchive as it's back-end
archiving/dearchiving infrastructure. Includes test harness;
"make check" in the bsdcpio directory to build and run the test
harness.
