opengl32: make the old code before the "sync the dibsection to its pixmap" patch be selectable at runtime.

[Leon Freitag]

> On Sun, Mar 12, 2006 at 05:44:57PM +0100, Leon Freitag wrote:
> > The patch
> > http://source.winehq.org/git/?p=wine.git;a=commit;h=13268261bbe0d4013937a
> >6a9804fbda378244512 has introduced an annoying performance regression
> > which affected all opengl games. (see
> > http://bugs.winehq.org/show_bug.cgi?id=4499).
>
> Does this help?
>
> Huw.
It is indeed a bit faster, however the performance is still far from the old 
value.
I don't see any other way to speed this up the way it's being synced now, the 
question is however, whether the apps really _should_ modify the bitmap on 
windows too (don't know whether they would try to draw controls onto the 
window and then it would be overdrawn by the opengl image; application like 
Steam are trying to achieve similar, but they seemed to work well before)

Leon
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