sys/socket.h: define SOL_IPV6?

[Christopher Faylor]

On Sun, Apr 26, 2009 at 10:22:07PM -0500, Yaakov (Cygwin/X) wrote:
>Does it make sense to define SOL_IPV6 now?  Patch attached if so.

I think it does.  I've checked in this patch.  I'm sure Corinna will
revert it if I am wrong.

Thanks.

cgf