Enable symbol lookup cache in doxygen for faster docs generation
Enable symbol lookup cache in doxygen for faster docs generation

--HG--
branch : v1-8

jhu-lcsr-forks/ogre,nezticle/ogre,vancepym/ogre,largerussiangames/ogre,jhu-lcsr-forks/ogre,vancepym/ogre,jhu-lcsr-forks/ogre,largerussiangames/ogre,largerussiangames/ogre,nezticle/ogre,nezticle/ogre,vancepym/ogre,vancepym/ogre,vancepym/ogre,jhu-lcsr-forks/ogre,jhu-lcsr-forks/ogre,nezticle/ogre,largerussiangames/ogre