Remove -fms-extensions throughout the tree

During a discussion about using -fms-extensions jhb pointed out that
we have them enabled in the kernel for gcc by default (even multiple
times in one part

Remove -fms-extensions throughout the tree

During a discussion about using -fms-extensions jhb pointed out that
we have them enabled in the kernel for gcc by default (even multiple
times in one part). I had missed all that and clang still failed on
my use case (needing another option).

The original cause for enabling them for our tree back then was that
we needed to support C11 anonymous struct/unions.
Our in-tree gcc 4.2.1, despite later patches, needed the
-fms-extensions to support these even though this was not the expected
use case for that option ( cc4a90c445aa0 enabled it globally for the
kernel).
clang at that time (or at least when it became default for 10.0)
already was fine (with C11).

Any later gcc (4.6.0 onwards) did not need that option anymore, even
when compiled for -std=iso9899:1990 (which does not support anonymous
structs/unions) unless one would add -pedantic (see gcc git 4bdd0a60b27a).
This is also the reason why userland cddl sources now compile with the
option removed despite CSTD=c99.

The only driver which needed the option recently was ccp, but that was
fixed in 8d3f41dbcb2a by jhb.

So cleanup all uses cases of -fms-extensions for the moment as they are
no longer needed given all compilers currently supported seem to be
fine without them and gcc-4.2.1 was removed from the tree in stable/13
in 2020 (a9854bc3812b).

Reported by: jhb (all this but possibly the world CDDL parts)
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: emaste (earlier), imp, jhb, glebius
Differential Revision: https://reviews.freebsd.org/D55072

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

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

sys: Stop enabling -Wnested-externs.

clang doesn't implement this warning, so violations are only caught by
GCC. It is also no longer a common practice to use this as it was in
the original BSD cod

sys: Stop enabling -Wnested-externs.

clang doesn't implement this warning, so violations are only caught by
GCC. It is also no longer a common practice to use this as it was in
the original BSD code, so the need for the warning is not as important
as when it was used to do cleanups 20 years ago. A recent commit
(c3179891f897d840f578a5139839fcacb587c96d) triggers this warning on
GCC, but that commit uses nested externs purposefully.

Reviewed by: markj, emaste
Differential Revision: https://reviews.freebsd.org/D39214

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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

Merge from head

Catch up with head, primarily for the 1.14.4.0 firmware.

Merge ^/head r285341 through r285792.

Merge driver for PMC Sierra's range of SAS/SATA HBAs.

Submitted by: Achim Leubner <Achim.Leubner@pmcs.com>
Reviewed by: scottl

Driver 'pmspcv' added. Supports PMC-Sierra PM8001/8081/8088/8089/8074/8076/8077 SAS/SATA HBA Controllers.