PR/57889: Ricardo Branco: ext2fs does not have user immutable and append
file flags, only system ones. Restrict those to the superuser. Before
the behavior was controlled by EXT2FS_SYSTEM_FLAGS. Make that behavior the
default.

UFS/LFS dirhash:
- Enable UFS_DIRHASH if the architecture or kernel model specific config
file can use 128MB of RAM or more.
- Remove experimental tag from UFS_DIRHASH; it's been with RUMP kernel
and by a number of NetBSD developers for years.
- Add LFS_DIRHASH if LFS was enabled.
- Be somewhat consistent with FS options order.

fix various typos, mainly in comments.

add a commented out compat_ossaudio wherever there's compat_linux

requested by mrg

branches: 1.18.2;
vether: Add to kernel configurations

It's only enabled if the kernel enabled bridge AND tap.
Otherwise it's commented out.

remove 'file-system SMBFS' and 'pseudo-device nsmb' from all kernel configs
to prepare for their eventual removal

Enable BUFQ_PRIOCSCAN, CARP, Veriexec by default in GENERIC kernel configs.
On ports without a GENERIC kernel config enable in individul files, e.g evbmips.
Omit on:
atari, dreamcast, emips, epoc32, evbppc/VIRTEX*, ia64, luna68x, mvme68k,
mvmeppc, playstation2, riscv, sun2, sun3, x68k, zaurus due to resource
constraints or port infancy.

Enable the per-priority cyclical scan buffer queue strategy on evbmips kernels.

time results of a Lemote Fuloong 2F extracting the pkgsrc tree
brick$ time tar -jxf pkgsrc.tar.bz2
priocscan + log
612.90 real 103.45 user 194.98 sys
priocscan nolog
1345.48 real 103.57 user 274.32 sys
fcfs + log
736.02 real 101.71 user 192.95 sys
fcfs nolog
1475.16 real 103.06 user 271.14 sys

Remove compat_svr4 and compat_svr4_32, as discussed on tech-kern@ recently,
but also as discussed several times in the past.

Unreference IPF/PF from all the config files, and enable NPF instead when
wanted. This also fixes some inconsistencies I saw in several files (eg
IPF options while IPF was not compiled, IPF+PF enabled by default, etc).

branches: 1.12.2; 1.12.4;
clean up COMPAT_* options for native netbsd code:
- new series of files that are useful for saying "i want everything
since netbsd 1.4", etc.
- use the fact COMPAT_* options have future dependancies to remove
many redundant options.

removes about 3000 lines total across kernel configuration files.
tested about 30 random kernels in the changed list.

Comment out 'options DEBUG' on all evbmips kernels

We aren't using DEBUG on other archs, mips is stable enough now, etc.

Wrong architecture for IBCS2 compat! it's stringly an x86 thing.

Remove references to compat_freebsd when it is not supported.

Remove TCP_COMPAT_42 from the config files. Pass 3.

branches: 1.7.6;
PR kern/51208
Add DISKLABEL_EI option (and also FFS_EI if missing), commented out except for
ALL on amd64 and i386.

branches: 1.6.2; 1.6.4;
Remove KMEMSTATS.

branches: 1.5.2;
Systematize (and in many cases, fix) the comments on options COMPAT_NN.

There are quite a few configs that are missing some COMPAT_NN options
in ways that don't make sense; this should probably get cleaned up
too, but for the time being I've not added or removed anything.

branches: 1.4.2;
Reorganize symbol table embedding. The existing option SYMTAB_SPACE is
replaced by the make option COPY_SYMTAB set to any value. The copy of
the symbol table is no longer put into a buffer in kern_ksyms.o, but a
small helper object. This object is build first with a dummy size, then
the kernel is linked to compute the real dimension of the symbol table
buffer. After that, the helper object is rebuild and the kernel linked
again.

Add "options COMPAT_70" to all kernel configuration files that
already had "options COMPAT_60".

branches: 1.2.2;
Add commented out bpfjit options to mips kernels.
While here, add 2 missing RCS ids.

branches: 1.1.2; 1.1.4;
Add configs for the Zyxel Keenetic Extra.