Updte zzuf to 0.12.
Based on PR#44274, with some fixes.

Changes from zzuf 0.12 to 0.13

* various fixes for Linux, FreeBSD, OS X and OpenBSD libc calls.
* network host filtering support.
* support for memory limits on OS X.
* massive testsuite improvements.
* support most cat options in zzcat, which is now fully programmable.

(obache)