libc: rename arm and i386 Ovfork.S to vfork.S

While this has been Ovfork.S forever on i386 it differs from other
syscalls that require wrappers for no obvious reason so fix that.

Reviewed by: kib
S

libc: rename arm and i386 Ovfork.S to vfork.S

While this has been Ovfork.S forever on i386 it differs from other
syscalls that require wrappers for no obvious reason so fix that.

Reviewed by: kib
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D42909

(cherry picked from commit 0ea469bcd548d29bbbc970325e4fa851d0e4c022)

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libc: Centralize non-building of sbrk stubs

The actual implementation of sbrk(2) is on top of the undocumented
break(2) system call. On powerpc* this means we don't build _sbrk and
__sys_sbrk which

libc: Centralize non-building of sbrk stubs

The actual implementation of sbrk(2) is on top of the undocumented
break(2) system call. On powerpc* this means we don't build _sbrk and
__sys_sbrk which were neither used nor exposed for linkage. Otherwise
it is a no-op.

The addition to lib/libc/sys/Makefile.inc is a direct commit to
stable/14 in lieu of merging the removal of the sbrk and sstk syscalls.

(cherry picked from commit 7893419d492c40ca82b68fca3dcc0f5f7047d39b)

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D43159

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libc/<arch>/sys/Makefile.inc: remove cruft

Remove stray blank lines left over from $FreeBSD$ removal as well as
some CVS-era (perhaps pre-repocopy) version comments.

Reviewed by: emaste
Differentia

libc/<arch>/sys/Makefile.inc: remove cruft

Remove stray blank lines left over from $FreeBSD$ removal as well as
some CVS-era (perhaps pre-repocopy) version comments.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D42611

(cherry picked from commit b73eace889f1db518a7b0b3372351e0cbf550085)

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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

(cherry picked from commit 559a218c9b257775fb249b67945fe4a05b7a6b9f)

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