[Bug 28869] Neverwinter Nights fails to load

https://bugs.winehq.org/show_bug.cgi?id=28869

--- Comment #12 from Ken Thomases  ---
Created attachment 47418
  --> https://bugs.winehq.org/attachment.cgi?id=47418
Patch to fix

This removes the clearing of the GL context that loses the app's context
unrecoverably.  It was originally introduced with
http://source.winehq.org/git/wine.git/commit/77face22d5365d94b9bfe614ed202692e1523593.
 It doesn't seem related to the rest of the stuff in that commit, but I may not
have followed the logic.

There's a comment that the clearing was necessary to work around driver bugs,
but doesn't elaborate.  I'm tempted to revert this part of it and see what
breaks so it can be fixed the right way and with the appropriate documentation.