Scrollbars and scrollwheel: -fomit-frame-pointer problems

[Mike Hearn]

> Seems like I found out which flags causes trouble with the scrollbars and
> the mouse's scrollwheel: building wine without -fomit-frame-pointer flag
> makes it work right.

Using this switch is almost always a bad idea, as it makes getting 
backtraces impossible. OK, without debug symbols, they are of only 
limited usefulness but I've still been able to track down problems 
before using a stripped backtrace.

-fomit-frame-pointer is one of those "optimizations" that does more harm 
than good in my opinion.

If you are right and this is causing misbuilds, perhaps we should have a 
check in the configure script for over-agressive optimization. Alexandre?