clock_gettime: Catch up with the CLOCK_BOOTTIME changes

When CLOCK_BOOTTIME was made an alias for CLOCK_MONOTONIC, the man page
wasn't updated. Update to include the changed semantics (it was to be

clock_gettime: Catch up with the CLOCK_BOOTTIME changes

When CLOCK_BOOTTIME was made an alias for CLOCK_MONOTONIC, the man page
wasn't updated. Update to include the changed semantics (it was to be
better compatible with Linux). Clarify the details of these clocks.
Provide a reference to the UTC standard, and a clarifying remark
about leap second encoding (fun fact: POSIX provides no unique
value for these, nor definitive values to use).

Sponsored by: Netflix

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clock_gettime.2: fix markup

The CLOCK_* constants are "defined variable or preprocessor constants"
and so use .Dv.

Reviewed by: imp
Sponsored by: The FreeBSD Foundation
Differential Revision: https

clock_gettime.2: fix markup

The CLOCK_* constants are "defined variable or preprocessor constants"
and so use .Dv.

Reviewed by: imp
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D45106

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libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths to allow libc to find them in their new home.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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