libc: move __ssp_overlap back out into <ssp/ssp.h>

We'll be using it in some upcoming definitions in headers, so move it
back now but slap a warning on it. Our upcoming uses will all be inside
of i

libc: move __ssp_overlap back out into <ssp/ssp.h>

We'll be using it in some upcoming definitions in headers, so move it
back now but slap a warning on it. Our upcoming uses will all be inside
of inline functions, so we're not overly concerned about double
evaluation immediately.

Reviewed by: markj
Sponsored by: Klara, Inc.
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D45677

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Import _FORTIFY_SOURCE implementation from NetBSD

This is a mostly-unmodified copy of the various *_chk implementations
and headers from NetBSD, without yet modifying system headers to start
actuall

Import _FORTIFY_SOURCE implementation from NetBSD

This is a mostly-unmodified copy of the various *_chk implementations
and headers from NetBSD, without yet modifying system headers to start
actually including them. A future commit will also apply the needed
bits to fix ssp/unistd.h.

Reviewed by: imp, pauamma_gundo.com (both previous versions), kib
Sponsored by: Stormshield
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D32306

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