Fixed -msse flag when building with MinGW.
Fixed -msse flag when building with MinGW.

--HG--
branch : v1-8

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