More conservative umask

Set the file creation mask consistently because the files these scripts
create can become part of an iso image.

Deprecate extsrc/, EXTSRCSRCDIR, MKEXTSRC

Remove support for building extsrc/:
1. Makefile: remove do-extsrc target.
2. build.sh: remove options -y and -Y extsrcdir.
3. distrib/sets: remove support

Deprecate extsrc/, EXTSRCSRCDIR, MKEXTSRC

Remove support for building extsrc/:
1. Makefile: remove do-extsrc target.
2. build.sh: remove options -y and -Y extsrcdir.
3. distrib/sets: remove support for extsrc in various tools
including the options -L ext and -y, and the extsrc sets.
4. doc/BUILDING.mdoc: remove docs for extsrc/, EXTSRCSRCDIR, MKEXTSRC (etc)
5. bsd.own.mk and various Makefiles: remove support for extsrc/,
EXTSRCSRCDIR, MKEXTSRC.

As proposed on tech-kern and tech-userlevel on 2022-01-07
and followed up on 2022-08-21.

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there is no -X flag

Fix syntax error on OSX 10.5.
While here, simplify handling with OPTARG using IFS.

developped with and 'go for it' dsl@

Support "extsrc", externally added programs and libraries. Users can write
their own reach-overs, cross-build, install, and get set files just like base
and X11 / X.org. (These sets are not include

Support "extsrc", externally added programs and libraries. Users can write
their own reach-overs, cross-build, install, and get set files just like base
and X11 / X.org. (These sets are not included as TNF releases.)

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Use "$*", not "$@", where we want a space-separated list of words.

Ensure that (almost) all shell variables in distrib/sets/* scripts are
used with curly braces and quotes, as in "${var}".

Also ensure that command substitution is quoted, as in "$(command)", and
con

Ensure that (almost) all shell variables in distrib/sets/* scripts are
used with curly braces and quotes, as in "${var}".

Also ensure that command substitution is quoted, as in "$(command)", and
convert `command` to $(command).

Reviewed by agc

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Add shell variables defined in sets.subr for almost all commands used
by scripts in distrib/sets/*. This is intended to be useful when cross
building. Only trivial commands like echo, cat, and rm a

Add shell variables defined in sets.subr for almost all commands used
by scripts in distrib/sets/*. This is intended to be useful when cross
building. Only trivial commands like echo, cat, and rm are excluded
from this treatment.

While I am here, make ${MTREE} and ${DB} follow the pattern used by most
other such variables.

Reviewed by agc.

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Make all the sets scripts work even when not run from the directory that
they reside in.
Change any uses of dirname to use shell variable substitution instead.

implement -l, to list the selected set names rather than the contents

optimise invocation of list_set_files()

rename all the <bsd.own.mk> derived variables to uppercase, and export
them to the environment.

Significant overhaul of how the sets are used:

* Add an optional third field to the sets file which is a list of
comma separated keywords that control if the line is printed.
Currently supported

Significant overhaul of how the sets are used:

* Add an optional third field to the sets file which is a list of
comma separated keywords that control if the line is printed.
Currently supported keywords
kerberos4 ${MKKERBEROS4} != no
kerberos ${MKKERBEROS} != no
lint ${MKLINT} != no
obsolete ${obsolete} != 0.
In this case, non obsolete files are not printed.
(This will allow future support for builds with variables such as
MKHESIOD and MKYP set to "no".)

* Use sh(1)'s getopts where appropriate, and otherwise cleanup the
various scripts.

* Move defaults for sets.subr from sets.defaults into sets.subr.
Move replicated code for determining stuff such as shlibs type
from various scripts into sets.subr.

* Merge the obsolete.*, krb.*, krb4.* and lint.* into the appropriate
main lists with the relevant third field keyword(s).

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Redo creation of sets/sums so this can be parallelized if using -j.
Suggested in PR#20115 and PR#20116

Factor duplicated code for setting variables such as machine_cpu
and machine_arch to their defaults into sets.defaults, and source
it at the top of each script.

Also, to be consistent with variable

Factor duplicated code for setting variables such as machine_cpu
and machine_arch to their defaults into sets.defaults, and source
it at the top of each script.

Also, to be consistent with variable naming, s/arch/machine_arch/.

sets.defaults introduces two new variables, krb and krb4, which
will affect whether Kerberos- or Kerberos IV-only files are put
into the set lists.

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Backout last change, it's not necessary.

Fix sets handling so that GCC specific lists are really used.

add initial support for gcc3

Don't duplicate code for listing sets used by makeplist, regpkg.
Instead, use the routine in sets.subr.

Check if md.${MACHINE}.${MACHINE_ARCH} exists and prefer it over
md.${MACHINE}.

Do not try to build LKMs on evbppc, because we cannot predetermine
the PPC_INTR_IMPL, which is used to include a file in <machine/intr.h>.
To allow evbppc to complete a ``make release'', we also need

Do not try to build LKMs on evbppc, because we cannot predetermine
the PPC_INTR_IMPL, which is used to include a file in <machine/intr.h>.
To allow evbppc to complete a ``make release'', we also need to
factor out the LKM files to a new set list file, and tweak makeflist
to not include this file for evbppc.

Discussed with Matt Thomas.

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Enable MIPS now that crunchgen works again for this arch.

Remove conditional for x86_64 to not include lintlibs, they're ok now.

use ${make} instead of ${MAKE} in the shell scripts, to prevent weird
lossage with the modified ${MAKE} getting passed to child make's