s3: locking: Rename xxx_windows_lock_ref_count to xxx_lock_ref_count.

We will be using this to also ref count a posix lock applied
to a file handle when changing to open file description lock
semantics.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Jeff Layton <jlayton@samba.org>
