Update CFLAGS for clang compatibility

* Clang/llvm does not (yet) support -m(no-)spe, so make it gcc-only
* Clang now supports -msoft-float, and does not appear to recognize
"-disable-ppc-float-in

Update CFLAGS for clang compatibility

* Clang/llvm does not (yet) support -m(no-)spe, so make it gcc-only
* Clang now supports -msoft-float, and does not appear to recognize
"-disable-ppc-float-in-variadic", which appears to have been a crutch until
soft-float was implemented. It's now implemented for both 32- and 64-bit.
* Clang/llvm use a 'medium' code model by default for powerpc64, supporting up
to 4GB TOC, and does not support the '-mminimal-toc' option. Given both of
these, make -mminimal-toc gcc-only.

MFC after: 2 weeks

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Connect the SHA-512t256 and Skein hashing algorithms to ZFS

Support for the new hashing algorithms in ZFS was introduced in r289422
However it was disconnected because FreeBSD lacked implementations

Connect the SHA-512t256 and Skein hashing algorithms to ZFS

Support for the new hashing algorithms in ZFS was introduced in r289422
However it was disconnected because FreeBSD lacked implementations of
SHA-512 (truncated to 256 bits), and Skein.

These implementations were introduced in r300921 and r300966 respectively

This commit connects them to ZFS and enabled these new checksum algorithms

This new algorithms are not supported by the boot blocks, so do not use them
on your root dataset if you boot from ZFS.

Relnotes: yes
Sponsored by: ScaleEngine Inc.

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MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Mfh r292839

Replace sys/crypto/sha2/sha2.c with lib/libmd/sha512c.c

cperciva's libmd implementation is 5-30% faster

The same was done for SHA256 previously in r263218

cperciva's implementation was lacking SHA

Replace sys/crypto/sha2/sha2.c with lib/libmd/sha512c.c

cperciva's libmd implementation is 5-30% faster

The same was done for SHA256 previously in r263218

cperciva's implementation was lacking SHA-384 which I implemented, validated against OpenSSL and the NIST documentation

Extend sbin/md5 to create sha384(1)

Chase dependancies on sys/crypto/sha2/sha2.{c,h} and replace them with sha512{c.c,.h}

Reviewed by: cperciva, des, delphij
Approved by: secteam, bapt (mentor)
MFC after: 2 weeks
Sponsored by: ScaleEngine Inc.
Differential Revision: https://reviews.freebsd.org/D3929

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Merge from head

Sponsored by: Gandi.net

Merge from head

Finish merging from head, messed up in previous attempt

Merge from head

Merge ^/head r287527 through r287679.

Revert r286984 (adding opt_random.h to sys/modules/zfs/Makefile)

opt_random.h is no longer needed/referenced in the kernel build

X-MFC with: r287558

Merge ^/head r286858 through r287489.

Merge from HEAD

fix standalone build of zfs module

Not sure if this is a proper fix, but it does the job.

Catch up with head, primarily for the 1.14.4.0 firmware.

Merge ^/head r285924 through r286421.

Fix `make depend` in sys/modules

Reviewed by: delphij
Differential Revision: https://reviews.freebsd.org/D3291

Merge ^/head r285284 through r285340.

Rename zfs nvpair files to not colidate with our nvlist.

PR: 201356
Approved by: pjd (mentor)

Merge sync of head

MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Re-support CWARNFLAGS, lost when bsd.sys.mk was removed. Also, support
CWARNFALGS.$file centrally so we don't have to have it in all the
places. Remove a few warning flags that are no longer needed.

Re-support CWARNFLAGS, lost when bsd.sys.mk was removed. Also, support
CWARNFALGS.$file centrally so we don't have to have it in all the
places. Remove a few warning flags that are no longer needed.
Also, always use -Wno-unknown-pragma to (hopefully temporarily) work
around #pragma ident in debug.h in the opensolaris code. Remove some
stale warning suppression that's no longer necessary.

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Merge from head@274682