Jordan Williams aebebf72df FindOpenGL: Add support for a separate GLU include directory ...

Add a OPENGL_GLU_INCLUDE_DIR cache variable for `GL/glu.h` and attach it
as an include directory to the `OpenGL::GLU` target.  Also add a
`OPENGL_INCLUDE_DIRS` result variable to list all include directories.
Account for the GLU header when deciding whether GLU is found.

Fixes: #25627

2024-02-05 14:06:06 -05:00

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