Fix a catch-22 that prevented OGRE_BUILD_PLATFORM_IPHONE from showing up in CMake-Gui.
Fix a catch-22 that prevented OGRE_BUILD_PLATFORM_IPHONE from showing up in CMake-Gui.

--HG--
branch : v1-7

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