libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Kee

libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Keep those.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D42385

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Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Merge ^/head r325999 through r326131.

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier f

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

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Merge ^/head r305087 through r305219.

MFhead @ r305170

'addrlen' does not matter when we need to find the first non-zero bit in
the byte from the left and 'addrlen' already counted in 'lim'.

PR: 212121
Submitted by: Herbie.Robinson@stratus.com
MFC

'addrlen' does not matter when we need to find the first non-zero bit in
the byte from the left and 'addrlen' already counted in 'lim'.

PR: 212121
Submitted by: Herbie.Robinson@stratus.com
MFC after: 7 days

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Apply the same qsort() usage fix as in r304911 getaddrinfo.c
qsort() can't be stabilized with just return(-1) alone.

MFC after: 3 days

Don't call free_addrselectpolicy(&policyhead) before policyhead has been
initialized.

Reported by: Coverity
CID: 1018727

libc: spelling fixes.

Mostly on comments.

libc: use our roundup2/rounddown2() macros when param.h is available.

rounddown2 tends to produce longer lines than the original code but
still it makes the code more readable.

libc: make some more use of the nitems() macro.

We have an nitems() macro in the <sys/param.h> header that is
convenient to re-use as it makes things easier to read.
Given that it is available alrea

libc: make some more use of the nitems() macro.

We have an nitems() macro in the <sys/param.h> header that is
convenient to re-use as it makes things easier to read.
Given that it is available already without adding additional
headers and other parts of libc already use it, extend a bit
more its use.

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MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

MFH @r292599

This includes the pluggable TCP framework and other chnages to the
netstack to track for VNET stability.

Security: The FreeBSD Foundation

Use _map_v4v6_address().

MFC after: 1 week

Catch up with HEAD (r280229-r284686).

Merge sync of head

Merge from head

MFH: r280643-r281852

Sponsored by: The FreeBSD Foundation

Stop including if_var.h from userland.

Sponsored by: Nginx, Inc.

Merge head r233826 through r256722.

IFC @256277

Approved by: ken (mentor)

IFC @ r255692

Comment out IA32_MISC_ENABLE MSR access - this doesn't exist on AMD.
Need to sort out how arch-specific MSRs will be handled.

Merge head

IFC @ r255459