[1/5] resend include: bring in6_addr into line with the MS definition

[Jeff Latimer]

Kai Blin wrote:
>> This version is based on the Vista PSDK and
>> places the definition in in6addr.h.
>>     
>
> Is there any reason you're putting this into an extra header? The PSDK I have 
> around keeps this in ws2ipdef.h
>   
My Vista PSDK breaks into the extra header.  It does the same for the 
IPV4 address too (ie. inaddr.h) but I haven't addressed that.

Jeff