sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

zlib: Use NO_WDEPRECATED_NON_PROTOTYPE

Also add it to kern.mk so it's available for module builds.

Sponsored by: Netflix
Noticed by: mjg
Fixes: b9f235ba3178
Differential Revision: https://reviews.freebsd.org/D38550

zlib: silence K&R warns

Sponsored by: Rubicon Communications, LLC ("Netgate")

Suppress -Wstrict-prototypes for several zlib files

Clang 15 is more strict about function definitions not matching
declarations, and zlib has a lot of these, but since it is contributed
code (and in K&R style to boot), suppress those warnings instead.

MFC after: 3 days

Remove zlib 1.0.4 from kernel.

PR: 229763
Reviewed by: emaste, Yoshihiro Ota <ota j email ne jp>
Differential Revision: https://reviews.freebsd.org/D21375

Expose zlib's utility functions in Z_SOLO library when building kernel.
This allows kernel code to reuse zlib's implementation.

PR: 229763
Reviewed by: Yoshihiro Ota <ota j email ne jp>
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D21156

Allow Kernel to link in both legacy libkern/zlib and new sys/contrib/zlib,
with an eventual goal to convert all legacl zlib callers to the new zlib
version:

* Move generic zlib shims that are not specific to zlib 1.0.4 to
sys/dev/zlib.
* Connect new zlib (1.2.11) to the zlib kernel module, currently built
with Z_SOLO.
* Prefix the legacy zlib (1.0.4) with 'zlib104_' namespace.
* Convert sys/opencrypto/cryptodeflate.c to use new zlib.
* Remove bundled zlib 1.2.3 from ZFS and adapt it to new zlib and make
it depend on the zlib module.
* Fix Z_SOLO build of new zlib.

PR: 229763
Submitted by: Yoshihiro Ota <ota j email ne jp>
Reviewed by: markm (sys/dev/zlib/zlib_kmod.c)
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D19706

sys/modules: normalize .CURDIR-relative paths to SRCTOP

This simplifies make output/logic

Tested with: `cd sys/modules; make ALL_MODULES=` on amd64
MFC after: 1 month
Sponsored by: Dell EMC Isilon

Move zlib.c from net to libkern.

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

- Import the HEAD csup code which is the basis for the cvsmode work.

Give zlib the ability to be a module that can be depended on,
in the MODULE_DEPEND() sense.