91f251b2ab
The HAVE_ZFS macro was dropped from the Makefile during the OpenZFS merge, bring it back. While here, drop unused WARNS setting. PR: 255616 Reported by: Michael Büker <freebsd@michael-bueker.de> Submitted by: Michael Büker <freebsd@michael-bueker.de> Fixes: 9e5787d2284e187abb5b654d924394a65772e004 Reviewed by: markj MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D30221