- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

nftw(): POSIX says directories causing loops should be silently skipped.

Formerly, loops caused nftw() to abort the traversal with ELOOP.

Refresh with OpenBSD RCS ID changes to reflect that we now have essentionally
the same file.

nftw(): Do not check the maxfds argument against OPEN_MAX.

Apart from the fact that nothing should have OPEN_MAX as a limit (as opposed
to RLIMIT_NOFILE from getrlimit() or _SC_OPEN_MAX from sysconf()), POSIX
does not require us to check this.

PR: 95239
Submitted by: Todd Miller

Replace the current implementations of ftw() and nftw() with the OpenBSD
implementations written by Todd C. Miller. These are cleaner, less buggy
and actively maintained.