/usr/lib/ssvnc/sshvnc is in ssvnc 1.0.29-2build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 | #!/bin/sh
# 
# wrapper for SSH_ONLY mode 
# 
PATH=`dirname "$0"`:$PATH; export PATH
SSVNC_SSH_ONLY=1; export SSVNC_SSH_ONLY
exec ssvnc -ssh "$@"
 |