system/libssh2: FTTFS: Couldn't create pid file "/run/sshd.pid": Permission denied

Found on x86_64; this just came up today for some reason:

=====================================
   libssh2 -: tests/test-suite.log
=====================================

# TOTAL: 3
# PASS:  2
# SKIP:  0
# XFAIL: 0
# FAIL:  1
# XPASS: 0
# ERROR: 0

.. contents:: :depth: 2

FAIL: ssh2.sh
=============

command-line line 0: Deprecated option UsePrivilegeSeparation
Server listening on 0.0.0.0 port 4711.
Server listening on :: port 4711.
Couldn't create pid file "/run/sshd.pid": Permission denied
command-line line 0: Deprecated option UsePrivilegeSeparation
Failure establishing SSH session
Unable to negotiate with 127.0.0.1 port 58016: no matching host key type found. Their offer: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa,ssh-dss [preauth]
Received signal 15; terminating.
FAIL ssh2.sh (exit status: 1)

This is likely an issue with this specific builder.