net/samba update to 3.0.22

I've updated net/samba to 3.0.22 to resolve a security vulnerability
(CAN-2006-1059).  However, I was unable to test the pam_winbind module.
If anyone can verify that it is still working correctly, please let
me know.

        Thanks,

        -- Johnny Lam <jlam%pkgsrc.org@localhost>