winex11: introduce a function to retrieve the glx drawable and have both the GET_GLX_DRAWABLE Escape and SwapBuffers call it.

[Huw Davies]

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 dlls/winex11.drv/init.c   |   13 +------
 dlls/winex11.drv/opengl.c |   89 ++++++++++++++++++++++++++++-----------------
 dlls/winex11.drv/x11drv.h |    2 +
 3 files changed, 58 insertions(+), 46 deletions(-)
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