Robert Wing 91f251b2ab fstyp(8): define HAVE_ZFS macro when built with zfs
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
2021-05-14 13:00:24 -08:00
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