Correctly position and clip opengl child windows

[Ulrich Czekalla]

Another attempt ... hopefully Alexandre likes  this better :-)

---
 dlls/opengl32/make_opengl   |   15 ++++
 dlls/opengl32/opengl_ext.h  |    5 ++
 dlls/opengl32/opengl_norm.c |   10 ++--
 dlls/opengl32/wgl.c         |   35 ++++++++++
 dlls/winex11.drv/opengl.c   |  155 ++++++++++++++++++++++++++++++++++++++++---
 5 files changed, 205 insertions(+), 15 deletions(-)
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