Defines starting with `c' in bsd/netccitt

• CALL bsd/netccitt/pk.h:202
• CALL_ACCEPTED bsd/netccitt/pk.h:203
• called_addrlen bsd/netccitt/pk_var.h:211
• calling_addrlen bsd/netccitt/pk_var.h:210
• CCITTPROTO_HDLC bsd/netccitt/x25.h:78
• CCITTPROTO_X25 bsd/netccitt/x25.h:79
• CLEAR bsd/netccitt/pk.h:204
• CLEAR_CONF bsd/netccitt/pk.h:205