The previous OpenBSD path built the right options ("-o port=N -T") but
still handed them to mount(8). On OpenBSD "-T" is a mount_nfs(8) flag,
not a mount(8) one, so mount rejected it with "mount: unknown option --
T" and the mount never ran. Call mount_nfs(8) directly on OpenBSD; the
options are already in its native syntax.
Verified on a real OpenBSD 7.9 arm64 VM: with this change the command
becomes "mount_nfs -o port=N -T localhost:/ <mnt>" and mount_nfs accepts
the flags. The mount then fails later with "Stale NFS file handle"
because the OpenBSD client and rclone's in-process NFS server disagree
on the root filehandle - that is a separate issue in the NFS server,
not in the mount options this PR is about.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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