editors/yui: Mark as broken on FreeBSD 12.0

../twww/libw3t.a(w3man.o): In function `HTLoadMan':
w3man.cc:(.text+0x2ff): undefined reference to `HTAnchor_physical'
w3man.cc:(.text+0x79a): undefined reference to `HTAtom_for'
w3man.cc:(.text+0x7a6): undefined reference to `HTAtom_for'
...

http://beefy11.nyi.freebsd.org/data/head-i386-default/p477696_s338122/logs/errors/yui-3.2.06.log

• Deprecate it; it appears to be unmaintained upstream with no real existing home