MFC r269873:
Fix broken pointer overflow check ns_name_unpack()

Many compilers may optimize away the overflow check `msg + l < msg',
where `msg' is a pointer and `l' is an integer, because pointer
overflow is undefined behavior in C.

Use a safe precondition test `l >= eom - msg' instead.

Reference:
https://android-review.googlesource.com/#/c/50570/

Requested by: pfg
Obtained from: NetBSD (CVS rev. 1.10)

MFC r269867:
Update our stub resolver to final version of libbind
(libbind-6.0).

Obtained from: ISC

MFC r269873:
Fix broken pointer overflow check ns_name_unpack()

Many compilers may optimize away the overflow check `msg + l < msg',
where `msg' is a pointer and `l' is an integer, because pointer
overflow is undefined behavior in C.

Use a safe precondition test `l >= eom - msg' instead.

Reference:
https://android-review.googlesource.com/#/c/50570/

Requested by: pfg
Obtained from: NetBSD (CVS rev. 1.10)

MFC r269867:
Update our stub resolver to final version of libbind
(libbind-6.0).

Obtained from: ISC