54685091f1
cogl-path uses types from glu.h, but to avoid a build dependency on glu, it kept a minified copy of glu.h in tree. Drop this file and just use the actual glu.h. To avoid linking to libGLU.so, just use the includepath, instead of actually adding glu as a real dependency. This means we can remove an includepath meant to make it possible to include <GL/glu.h>.