Please support download setup-x86_64.exe on IPv6-only network

[Jon Turney]

On 16/11/2023 01:40, Bin W via Cygwin wrote:
> https://www.cygwin.com/setup-x86_64.exe
> IPv6-only network can't download the installer.

I've spoken to the people who speak to the people who actually 
administer the DNS for us, and an IPv6 DNS record has been added for 
cygwin.com.

If there are any other problems with using IPv6, please let us know.