fix some warnings

CMakeModules/FCLVersion.cmake

include/fcl/broadphase/hierarchy_tree.hxx

src/BVH/BVH_model.cpp

src/BVH/BVH_utility.cpp

src/broadphase/broadphase_SaP.cpp

src/narrowphase/gjk.cpp

src/narrowphase/gjk_libccd.cpp