DP2ADD returns a scalar, and fglrx (correctly) complains that it can't
assign that to a 3 component vector.

glStencilFuncSeparateATI does not take a face argument, instead it
sets the front and back facing functions at once. This means the
renderstate_stencil_twosided helper function is somewhat pointless for
this extension.

explorer: Allow specifying a default size for each desktop using the HKCU\Software\Wine\Explorer\Desktops registry key.

services.exe: Don't reject config changes if the display name corresponds to the service being changed.

ImmSetCompositionString generates WM_IME_COMPOSITION. Therefore test always
fails if messages are not flushed.

This is needed for a new X11DRV_SetPixelFormatWINE function which allows you to change the pixel format multiple times.