gdi: Add WineGL driver interface and wrapper functions

[Tomas Carnecky]

This patch implements all necessary functions in GDI to support WineGL,
the Wine OpenGL implementation in x11drv.
This patch adds new functions to the driver interface and creates
wrapper functions for them. These wrapper functions are exported by
gdi32.dll.

ChangeLog:
 - gdi: Add WineGL driver interface and wrapper functions


tom