Remove GLU header

indra/cmake/OpenGL.cmake

@@ -4,7 +4,6 @@ include(Variables)
 include(Prebuilt)
 
 if (BUILD_HEADLESS)
-  SET(OPENGL_glu_LIBRARY GLU)
   SET(OPENGL_HEADLESS_LIBRARIES OSMesa16 dl GLU)
 endif (BUILD_HEADLESS)
 

indra/llrender/llglheaders.h

@@ -34,7 +34,6 @@
 #define GL_GLEXT_PROTOTYPES 1
 #include "GL/gl.h"
 #include "GL/glext.h"
-#include "GL/glu.h"
 
 // The __APPLE__ kludge is to make glh_extensions.h not symbol-clash horribly
 # define __APPLE__
@@ -54,12 +53,6 @@
 #include "epoxy/glx.h"
 #endif
 
-#if LL_DARWIN
-#include <OpenGL/glu.h>
-#else
-#include <GL/glu.h>
-#endif
-
 #endif // LL_MESA
 
 #endif // LL_LLGLHEADERS_H