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

After building packages we have a number of new
and updated Makefile.depend files

Reviewed by:	stevek

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

On MacOS, we bootstrap sort. Since ALTMON_* are not defined there, the
build blows up. Since we don't need this feature for the FreeBSD build
process, and since we won't use it unless we actually install the NL
files that have this data in it, just #ifdef it out for now. In the
extremely unlikely event that the FreeBSD bootstrap/build process grows
this dependency, we can evaluate the best solution then (which most
likely is going to be not depend on the local's month names).

Fixes:			3d44dce90a69 (MacOS builds and github CI)
Sponsored by:		Netflix
Reviewed by:		jrtc27, jlduran@gmail.com, markj
Differential Revision:	https://reviews.freebsd.org/D42868

The CLDR specification [1] defines three possible month formats:

- Abbreviation (e.g Jan, Ιαν)
- Full (e.g January, Ιανουαρίου)
- Standalone (e.g January, Ιανουάριος)

Many languages use different case endings depending on whether the month
is referenced as a standalone word (nominative case), or in date context
(genitive, partitive, etc.). sort(1)'s -M option currently sorts months
by testing input against only the abbrevation format, which is
essentially a substring of the full format. While this works fine for
languages like English, where there are no cases, for languages where
there is a different case ending between the abbreviation/full and
standalone formats, it is not sufficient.

For example, in Greek, "May" can take the following forms:

Abbreviation: Μαΐ (genitive case)
Full: Μαΐου (genitive case)
Standalone: Μάιος (nominative case)

If we use the standalone format in Greek, sort(1) will not able to match
"Μαΐ" to "Μάιος" and the sort will fail.

This change makes sort(1) test against all three formats. It also works
when the input contains mixed formats.

[1] https://cldr.unicode.org/translation/date-time/date-time-patterns

Reviewed by:	markj
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D42847

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by:		Netflix

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by:		Netflix

Remove /^\.\\"\s*\$FreeBSD\$$\n/

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

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