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EHOSTUNREACH

have to link with -lc_r explicitly.

Support transfer-source-v6 and query-source-v6

Is now an error if a IPv6 address is used in a transfer-source or
query-source statement.
Ditto for an IPv4 address in *-v6 statement.
Cleaned up error messages.

Get them out together.
Support query-source-v6 dnd transfer-source-v6

from signer.c if nxtify is ever going to be used.

they are ignored by named anyway, and getting their flags seems to fail on
Solaris 8ea (RT #16)

iteration (after reporting them); in particular, do not INSIST() that
no such errors occur.  Clarify the way this works by using the new
ISC_R_IGNORE result code.

 by the interface iterator internals to indicate that an
interface is to be ignored.  Previously ISC_R_FAILURE was
used for this purpose.