dlls/user.exec16/user.c: Use FIXME_ONCE for quieter reports

[James McKenzie]

Dan Kegel wrote:
> James wrote:
>   
>> This whole line of thought was rejected, at least once.
>>     
>
> Yes, but see his later patchset.  I think he's
> now just trying to provide a uniform abstraction for the existing
> ad-hoc single-shot FIXMEs without adding any new ones,
> following Henri's advice in
> http://www.winehq.org/pipermail/wine-devel/2010-July/085069.html
>
>   
Thank you for the correction, Dan.  The patches looked very similar that 
is why I asked the question.

James McKenzie