lib/libc/tests/string/stpncpy_test.c: extend for upcoming SSE implementation

This adds additional unit tests validating the function for
All possible alignment offsets of source and destination.

Al

lib/libc/tests/string/stpncpy_test.c: extend for upcoming SSE implementation

This adds additional unit tests validating the function for
All possible alignment offsets of source and destination.

Also extend the test to allow testing of an external stpncpy
implementation, which greatly simplifies the development of
custom implementations.

Sponsored by: The FreeBSD Foundation
Tested by: developers@, exp-run
Approved by: mjg
MFC after: 1 month
MFC to: stable/14
PR: 275785
Differential Revision: https://reviews.freebsd.org/D42519

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libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Kee

libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Keep those.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D42385

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Remove $FreeBSD$: one-line .c pattern

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

Have stpncpy tests ask the kernel for the page size

It may be dynamic so we can't rely on PAGE_SIZE being present or
correct.

MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Catch up with head (r291075).

Integrate tools/regression/lib/libc/string into the FreeBSD test suite
as lib/libc/tests/string

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division