[Virtio-fs] [virtiofsd] MR opened: Adds 'posix_acl' option

[virtiofs-bot at sinrega.org]

Adds options to enable/disable FUSE_POSIX_ACL by specifying <br>
option --posxi_acl or -o posix_acl/no_posix_acl

The C version had this option too.
So this is a step to make the Rust version once again a bit closer to be a drop in replacement.

Signed-off-by: Jan Braun <jan-kai at braun-bs.de>
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https://gitlab.com/virtio-fs/virtiofsd/-/merge_requests/81