Defines starting with `h' in netccitt

• HDHEADERLN netccitt/hdlc.h:92
• HDLCPROTO_LAP netccitt/x25.h:58
• HDLCPROTO_LAPB netccitt/x25.h:59
• HDLCPROTO_LAPD netccitt/x25.h:61
• HDLCPROTO_UNSET netccitt/x25.h:60