include: Add dvoice.h

[Alistair Leslie-Hughes]

On 11/04/2014 4:52 PM, Dmitry Timoshkov wrote:
> Alistair Leslie-Hughes <leslie_alistair at hotmail.com> wrote:
>
>> Changelog:
>>         include: Add dvoice.h
>
> Isn't this supposed to be generated from an .idl? Also which PSDK version
> has this header? At least 7.1 doesn't contain it.
The original file SDK doesn't have a IDL for this so I thought it wasn't 
needed.

The header can be found in "Microsoft DirectX SDK (August 2007)"

Best Regards
  Alistair Leslie-Hughes