gjb da504cb140 Enable multi-threaded xz(1) compression, after r278433.
Allow multi-threaded xz(1) to be turned off by specifying
NO_XZTHREADS, and allow number of threads to be overridden
by specifying XZ_THREADS=N.

MFC after:	1 week
X-MFC-needs:	r278433
Sponsored by:	The FreeBSD Foundation
2015-02-09 10:42:27 +00:00
..
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