of makefiles: bsd.own.mk was included before ../Makefile.inc,
effectively hiding the (wrong) LIBCOMPATDIR assignment here.
share/mk/sys.mk,v 1.60 (and assorted share/mk fixes) fixed
this order, revealed this bug, and broke "make release" and
"make installworld" with either of -DCOMPAT1X or -DCOMPAT2?.
Reported by: jhay