use isc/lang.h and add protective UNIX_ERRNO2RESULT_H wrapper
use isc/lang.h and add protective UNIX_ERRNO2RESULT_H wrapper

pecharmin/bind9,pecharmin/bind9,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,each/bind9-collab,each/bind9-collab,each/bind9-collab,pecharmin/bind9,pecharmin/bind9