bug#40343: 28.0.50; dns-set-servers fails on IPv6 available Windows

[Robert Pluim]

>>>>> On Fri, 03 Apr 2020 23:08:10 +0900, Kazuhiro Ito <kzhr@d1.dion.ne.jp> 
>>>>> said:

    >> Thanks for that. This should fix all those cases:
    Kazuhiro> Thank you for the patch.  It works well on Cygwin environment.  
But I
    Kazuhiro> noticed different problems in dns-query when TCP is used.

Thanks for checking, pushed to master as 00f7744c1b

Closing the bug.

    Kazuhiro> 1. dns-write function needs to be called with TCP-P option.
    Kazuhiro> 2. First 2 bytes of received data (length field) should be 
truncated
    Kazuhiro> for dns-read function.  Or dns-read function should accept TCP-P
    Kazuhiro> option like dns-wrote function.

Indeed, looks like thatʼs never worked. Iʼll fix those separately.

Robert