Wine: Use GCC's -Wlogical-op if supported.

[Gerald Pfeifer]

On Tue, 21 Sep 2010, Alexandre Julliard wrote:
>>> I still see a ton of warnings here (gcc 4.4.5), mostly because of the
>>> glibc string macros.
>> Hmm, I see.  Still, this is really useful to have.  How about the patch 
>> below as an alternative?  Additional platforms can add this when/if they
>> want.
> This would have to be a compilation check with the appropriate headers,
> not a platform check.

Hmm, that's really a bit tricky given my level of autoconf skills;
anyone else who might give this a try?

Gerald