dirdeps: Update/fix Makefile.depend* for toolchain

This fixes make pseudo/toolchain.

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Update/fix Makefile.depend for userland

Update Makefile.depend files

Update a bunch of Makefile.depend files as
a result of adding Makefile.depend.options files

Reviewed by: bdrewery
MFC after: 1 week
Sponsored by: Juniper Networks
Differential Revision: https://reviews.freebsd.org/D22494

Update libedit to a snapshot from 2019-09-10

This version bring many fixes regarding unicode support
It also adds proper support for filename completion (we do not need our custom
patches anymore)
Improves the libreadline compatibility

Note that the same work was done by Yuichiro Naito in
https://reviews.freebsd.org/D21196 the main difference is in this case we have
reimported libedit in contrib to fix a long standing mess in the previous merges
which prevented a proper update workflow. (discussed long ago with pfg@)

The only difference with upstream libedit is we have added a compatibility shim
for the _elf_fn_sh_complete function which we previously added to support quoting
in filename completion and is not needed anymore.
This was added to continue supported old /bin/sh binaries and not break backward
compatibility (as discussed with jilles@)

Reviewed by: Yuichiro Naito <naito.yuichiro_gmail.com>
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D21584

DIRDEPS_BUILD: Update dependencies.

Sponsored by: Dell EMC Isilon

DIRDEPS_BUILD: Regenerate without local dependencies.

These are no longer needed after the recent 'beforebuild: depend' changes
and hooking DIRDEPS_BUILD into a subset of FAST_DEPEND which supports
skipping 'make depend'.

Sponsored by: EMC / Isilon Storage Division

META MODE: Prefer INSTALL=tools/install.sh to lessen the need for xinstall.host.

This both avoids some dependencies on xinstall.host and allows
bootstrapping on older releases to work due to lack of at least 'install -l'
support.

Sponsored by: EMC / Isilon Storage Division

dirdeps.mk now sets DEP_RELDIR

Updated dependencies

Updated dependencies

Updated dependencies

Updated dependencies

Updated/new Makefile.depend

Sync FreeBSD's bmake branch with Juniper's internal bmake branch.

Requested by: Simon Gerraty <sjg@juniper.net>