Add x64 support to vcproj.

include/kfm.h

include/obj/bhkConvexVerticesShape.h

include/obj/bhkListShape.h

include/obj/bhkMoppBvTreeShape.h

include/obj/bhkNiTriStripsShape.h

include/obj/bhkPackedNiTriStripsShape.h

include/obj/hkPackedNiTriStripsData.h

niflib.vcproj

src/obj/NiTriBasedGeom.cpp

src/obj/bhkConvexVerticesShape.cpp

src/obj/bhkListShape.cpp

src/obj/bhkMoppBvTreeShape.cpp

src/obj/bhkNiTriStripsShape.cpp

src/obj/bhkPackedNiTriStripsShape.cpp

src/obj/hkPackedNiTriStripsData.cpp