Defines starting with `c' in netccitt

• CALL netccitt/pk.h:178
• CALL_ACCEPTED netccitt/pk.h:179
• called_addrlen netccitt/pk_var.h:187
• calling_addrlen netccitt/pk_var.h:186
• CCITTPROTO_HDLC netccitt/x25.h:54
• CCITTPROTO_X25 netccitt/x25.h:55
• CLEAR netccitt/pk.h:180
• CLEAR_CONF netccitt/pk.h:181