Update Expat to 2.2.10: update expat version (2.2.10 now required)
Update to expat version 2.2.10 and avoid hacks in CMake files due to issues in expat CMake files < 2.2.10
Update to expat version 2.2.10 and avoid hacks in CMake files due to issues in expat CMake files < 2.2.10