[CMake] FindOpenGL.cmake proposed patch

[Fabrice Ménard]

Hi,

I propose the new variable OPENGL_GLU_INCLUDE_DIR as it might be different 
from OPENGL_INCLUDE_DIR (in particular on GNU/Linux with NVidia drivers).
I needed it in order to build KDE4 which failed to locate GL/glu.h.  I'll send 
a CMakeLists patch to the KDE mailing list if you accept this one.

Regards,
-- 
Ménard Fabrice
menard.fabrice at orange.fr

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