src: Use gnu17 as the default C standard for userland instead of gnu99

Tracking newer versions of C (and C++) permits assuming newer language
features in the base system. Some C11 extensions are al

src: Use gnu17 as the default C standard for userland instead of gnu99

Tracking newer versions of C (and C++) permits assuming newer language
features in the base system. Some C11 extensions are already used in
the base system but implemented on top of GNU C extensions such as
_Alignas and _Static_assert. In some cases the fallback versions in
cdefs.h are more limited than the native C11 extensions.

Even though C11 is the next major version of C, C17 is chosen instead
since C17 does not add new features to C but merely fixes defects in
C11. It is also well supported by a wide range of clang (7.0.0+) and
GCC (8.1+) versions.

Along with changing the default, this change also removes explicit
requests for c11 via the CSTD variable in various Makefiles.

Libraries and binaries for ZFS continue to use c99.

PR: 284039 (exp-run)
Reviewed by: imp, arichardson, emaste
Differential Revision: https://reviews.freebsd.org/D43237

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Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

Remove $FreeBSD$: one-line sh pattern

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

sort: remove NLS support

NLS support for sort(1) is:
1/ incomplete: many error string are not using nls
2/ only covers hu_HU.ISO8859-2

Move sort to runtime

Allows pkg bootstrap without having to install FreeBSD-utilities

usr.bin/sort: Avoid UBSan errors

UBSan complains about out-of-bounds accesses for zero-length arrays. To
avoid this we can use flexible array members. However, the C standard does
not allow for stru

usr.bin/sort: Avoid UBSan errors

UBSan complains about out-of-bounds accesses for zero-length arrays. To
avoid this we can use flexible array members. However, the C standard does
not allow for structures that only contain flexible array members, so we
move the length parameters into that structure too.

Split out from D28233.

Reviewed By: markj
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D31009

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sort: Hook NetBSD tests up to the build

MFC after: 1 week
Sponsored by: The FreeBSD Foundation

Merge ^/head r338026 through r338297, and resolve conflicts.

Don't use absolute path to sed when building usr.bin/join

This is required to build sort on Linux hosts since sed is in /bin there.

Approved By: jhb (mentor)

sort(1): Add bits to allow easy checking against NetBSD tests

I'm looking at sort(1) failures, for better or worse.

Merge sync of head

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

MFHead @ r275232

r274961 through r275075

Convert to usr.bin/ to LIBADD
Reduce overlinking

Sync to HEAD@r274766

Merge from head@274682

Change LDFLAGS to LDADD in order to allow static builds. This is more
proper way to ensure that the command line compile works the way we intend.

Add explicity DPADD statemens on LIBMD and LIBPTHRE

Change LDFLAGS to LDADD in order to allow static builds. This is more
proper way to ensure that the command line compile works the way we intend.

Add explicity DPADD statemens on LIBMD and LIBPTHREAD depending on which
options are used in the build.

Reviewed by: andrew
MFC after: 2 weeks

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Check in first src/tests snapshot from NetBSD anoncvs

Sources were obtained like so:

% export CVSROOT="anoncvs@anoncvs.NetBSD.org:/cvsroot"
% cvs -z9 co -D "09/30/2014 20:45" -P src/tests
% mv src/

Check in first src/tests snapshot from NetBSD anoncvs

Sources were obtained like so:

% export CVSROOT="anoncvs@anoncvs.NetBSD.org:/cvsroot"
% cvs -z9 co -D "09/30/2014 20:45" -P src/tests
% mv src/tests/* tests/dist/.

'*CVS*' has been added to svn:ignore to ease updating periodically from
upstream

Some line ending issues had to be resolved with test outputs and scripts
via dos2unix and by deleting the eol-style property set in usr.bin/sort

Discussed with: rpaulo
Sponsored by: EMC / Isilon Storage Division

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MFC @ r266724

An SVM update will follow this.

IFC @266473

Merge from head

Use src.opts.mk in preference to bsd.own.mk except where we need stuff
from the latter.

Merge head