add userenv.h

[Dan Kegel]

Dmitry wrote:
> Vijay wrote:
>> If you think i need to send a newer patch, i will send it monday.
>
>I hope that Alexandre won't accept this and other patches of a similar
>"style".

Indeed.

Vijay, your best bet at this point is probably to file bug reports in
bugs.winehq.org for the compilation errors you're trying to fix.

How many of your previous cvs contributions were similarly
"modified" from Microsoft headers?
- Dan