FindMagnum: it's FindFreetype.cmake, not FindFreeType.cmake.
FindMagnum: it's FindFreetype.cmake, not FindFreeType.cmake.

Although the library is still named FreeType. Fixes warnings in
dependent projects.

MiUishadow/magnum,DerThorsten/magnum,ashimidashajia/magnum,MiUishadow/magnum,ashimidashajia/magnum,MiUishadow/magnum,ashimidashajia/magnum,MiUishadow/magnum,DerThorsten/magnum,DerThorsten/magnum,MiUishadow/magnum,DerThorsten/magnum,DerThorsten/magnum,MiUishadow/magnum,ashimidashajia/magnum,ashimidashajia/magnum