Add the ability to detect ZFS and GELI encrypted file systems to fstyp(8)
MFC: r284644
Fix GCC Warnings
MFC: r284728
Only build ZFS support in absense of WITHOUT_ZFS
MFC: r285426
Remove excess copyrights
MFC: r286569
Use GELI sentinel constant
MFC: r287937
Eliminate unneeded copying of vdev data, goto, etc. and add a note
that checksum of vdev label should be checked (which is not done
currently).
No functional change.
While I'm there, raise WARNS to 2.
MFC: r292757
Fix order of includes in usr.sbin/fstyp/zfs.c
MFC: r292829
Eliminate unneeded includes.