Only define WIN32_LEAN_AND_MEAN if it's not already defined
Only define WIN32_LEAN_AND_MEAN if it's not already defined

--HG--
branch : v1-8

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