FreeBSD_HEAD_arm64 - Build #2060 - Fixed

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FreeBSD_HEAD_arm64 - Build #2060 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2060/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2060/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2060/console

Change summaries:

293204 by jilles:
Add sbin and /usr/local directories to _PATH_DEFPATH.

Set _PATH_DEFPATH to
/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin. This is the
path in the default class in the default /etc/login.conf,
excluding ~/bin which would not be expanded properly in a string
constant.

For normal logins, _PATH_DEFPATH is overridden by /etc/login.conf,
~/.login_conf or shell startup files. _PATH_DEFPATH is still used as a
default by execlp(), execvp(), posix_spawnp() and sh if PATH is not set, and
by cron. Especially the latter is a common trap (most recently in PR
204813).

PR:		204813
Reviewed by:	secteam (delphij), alfred

293202 by emaste:
rtld: populate DT_DEBUG iff DYNAMIC segment is writable

rtld.h was accidentally missed in r293201