wineserver: fix a gcc 4.0 warning

[Mike McCormack]

Marcus Meissner wrote:

>>     if (mailslot->read_timeout != MAILSLOT_WAIT_FOREVER)
>>-        timeout = &mailslot->read_timeout;
>>+        timeout = (int*) &mailslot->read_timeout;
> 
> 
> It would be better to change read_timeout to "int" instead I guess.

I'm not really sure, that why I've been avoiding changing this...

CreateMailslot takes timeout as a DWORD, and timeouts should not be 
negative.  Maybe fd_queue_async_timeout should take an unsigned int *?

Mike