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

Similar commit in main:
(cherry picked from commit d0b2dbfa0ecf)

This would allow interested parties to do experimental runs with an
environment set appropriately to raise all the warnings throughout the
build; e.g. env WARNS=6 NO_WERROR=yes buildworld.

Not currently touching the numerous instances in ^/tools.

MFC after:	1 week

variable name instead of LIBUCL (which would otherwise end up with the
staging directory used instead of the wanted source directory.)

Reviewed by:	sjg
Obtained from:	Juniper Networks, Inc.

MFC after:	3 days
Sponsored by:	Rubicon Communications, LLC (Netgate)

It replaces xxhash with mumhash
It fixes issues with msgpack on non x86

Sponsored by:	The FreeBSD Foundation

Now when a lib is marked as PRIVATELIB it is renamed into libprivate$foo instead
of being installed in /usr/lib/private and playing with rpath.

Also allow to install headers for PRIVATELIBS in that case the headers will be
installed in /usr/include/private/$foo

Keep the headers under a private namespace to prevent third party build system
to easily find them to ensure they are only used on purpose.

This allows for non base applications to statically link against a library in
base which is linked to a privatelib

Treating PRIVATELIBS as regular libraries allows to push them into our current
compatX packages if needed.

While here finish promotion of libevent as PRIVATELIB
Install header for bsdstat and libucl

Differential Revision:	https://reviews.freebsd.org/D2365
Reviewed by:	brooks, des
Discussed with:	imp