Log Message:
archivers/pxz: import pxz-4.999.9beta

Parallel XZ is a compression utility that takes advantage of running LZMA
compression of different parts of an input file on multiple cores and
processors simultaneously.
Its primary goal is to utilize all resources to speed up compression time
with minimal possible influence on compression ratio.

Packaged by ISIHARA Takanori and me in pkgsrc-wip/pxz.