Merge differences between openssh-8.8 and openssh-8.9

Merge our changes from OpenSSH-8.6 to OpenSSH-8.7

Merge conflicts

merge openssh-8.1

attribute police

merge conflicts.

merge conflicts

merge conflicts

merge conflicts.

merge conflicts

merge conflicts

merge conflicts.

merge conflicts

Use __dead.

Merge conflicts

merge openssh-6.7

merge conflicts.

merge OpenSSH 6.0

Features:

* ssh-keygen(1): Add optional checkpoints for moduli screening
* ssh-add(1): new -k option to load plain keys (skipping certificates)
* sshd(8): Add wildcard support

merge OpenSSH 6.0

Features:

* ssh-keygen(1): Add optional checkpoints for moduli screening
* ssh-add(1): new -k option to load plain keys (skipping certificates)
* sshd(8): Add wildcard support to PermitOpen, allowing things like
"PermitOpen localhost:*". bz #1857
* ssh(1): support for cancelling local and remote port forwards via the
multiplex socket. Use ssh -O cancel -L xx:xx:xx -R yy:yy:yy user@host"
to request the cancellation of the specified forwardings
* support cancellation of local/dynamic forwardings from ~C commandline

Bugfixes:

* ssh(1): ensure that $DISPLAY contains only valid characters before
using it to extract xauth data so that it can't be used to play local
shell metacharacter games.
* ssh(1): unbreak remote portforwarding with dynamic allocated listen ports
* scp(1): uppress adding '--' to remote commandlines when the first
argument does not start with '-'. saves breakage on some
difficult-to-upgrade embedded/router platforms
* ssh(1)/sshd(8): fix typo in IPQoS parsing: there is no "AF14" class,
but there is an "AF21" class
* ssh(1)/sshd(8): do not permit SSH2_MSG_SERVICE_REQUEST/ACCEPT during
rekeying
* ssh(1): skip attempting to create ~/.ssh when -F is passed
* sshd(8): unbreak stdio forwarding when ControlPersist is in use; bz#1943
* sshd(1): send tty break to pty master instead of (probably already
closed) slave side; bz#1859
* sftp(1): silence error spam for "ls */foo" in directory with files;
bz#1683
* Fixed a number of memory and file descriptor leaks

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merge openssh-5.9

Use __dead

- Merge conflicts
- WARNS=5

merge changes.

Merge in our changes:
- conditionalize login_cap
- conditionalize bsd_auth
- bring in pam from portable
- restore krb5, krb4, afs, skey
- bring in hpn patches, disable mt aes cipher, keep speedups an

Merge in our changes:
- conditionalize login_cap
- conditionalize bsd_auth
- bring in pam from portable
- restore krb5, krb4, afs, skey
- bring in hpn patches, disable mt aes cipher, keep speedups and cipher none
- add ignore root rhosts option
- fix ctype macro arguments
- umac is broken, disable it
- better ~homedir handling
- netbsd style tunnels
- urandom, xhome, chrootdir, rescuedir NetBSD handling
- utmp/utmpx handling
- handle tty posix_vdisable properly
- handle setuid and unsetuid the posix way instead of setresuid()
- add all missing functions
- add new moduli
- add build glue

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import 5.2 from ftp.openbsd.org