Soft updates (softdep) disabled for future VFS work

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A low key leak from the ongoing g2k23 hackathon comes the news that
soft updates
(aka
softdep) will, for now, be a no-op
on OpenBSD-current.

The commit message by Bob Beck (beck@) reads,

From:       Bob Beck <beck () cvs ! openbsd ! org>
Date:       2023-07-05 15:13:28

CVSROOT:	/cvs
Module name:	src
Changes by:	beck@cvs.openbsd.org	2023/07/05 09:13:28

Modified files:
	sys/kern       : vfs_syscalls.c 
	sys/sys        : mount.h 
	sys/ufs/ffs    : ffs_softdep.c ffs_vfsops.c 

Log message:
Make softdep mounts a no-op

Softdep is a significant impediment to progressing in the vfs layer
so we plan to get it out of the way. It is too clever for us to
continue maintaining as it is.

ok kettenis@ kn@ tobhe@ and most of the g2k23 room except bluhm@

We look forward to further work and explanation of the motivation behind this change, sure to follow.

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