Make.rules.in: Pass the --nounistd flag to flex since unistd.h is a header that might not be present on all systems.

[Robert Shearman]

Alexandre Julliard wrote:
> Robert Shearman <rob at codeweavers.com> writes:
>
>   
>> If we do need it, we can include it in the .l file after config.h and
>> with an appropriate include guard.
>>     
>
> You should instead put a %option in the files that need it.

The point is that all of the files need it. Only tools/widl/parser.l 
needs to include unistd.h and it already does so manually.

-- 
Rob Shearman