X11Drv: import glx context code

[Roderick Colenbrander]

Hi,

This patch moves most GLX context code and functions which depended on it from opengl32 to winex11.drv. The imported is the same as the original opengl32 code except for changes to ENTER_GL / LEAVE_GL related code. These calls got replaced by wine_tsx11_lock/_unlock. Further opengl32 now loads the moved opengl functions using GetProcAddress from winex11.drv.

For people who want to know why the OpenGL32 -> WineX11.drv move is needed. It is needed to fix some outstanding OpenGL bugs which can only be fixed from inside x11drv because Windows calls abstract too much stuff away. Further the change will allow the removal of various (hacky) ExtEscape calls and it will make it easier to add OpenGL support to a future Wibe OSX display driver.

Regards,
Roderick Colenbrander


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