Fix GL: On windows GLEWAPIENTRY is defined by APIENTRY which is already defined by windows so that we had linker errors (the functions have the wrong calling convention then)
Fix GL: On windows GLEWAPIENTRY is defined by APIENTRY which is already defined
by windows so that we had linker errors (the functions have the wrong calling
convention then)

--HG--
branch : v1-9

digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre