Add definitions for four new system calls:
Add definitions for four new system calls:

__acl_get_link()	Retrieve an ACL by name without following
			symbolic links.
__acl_set_link()	Set an ACL by name without following
			symbolic links.
__acl_delete_link()	Delete an ACL by name without following
			symbolic links.
__acl_aclcheck_link()	Check an ACL against a file by name without
			following symbolic links.

These calls are similar in spirit to lstat(), lchown(), lchmod(), etc,
and will be used under similar circumstances.

Obtained from:	TrustedBSD Project

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