kdl_typekit: use updated orocos_kdl find_package name (was Orocos-KDL)

See http://git.mech.kuleuven.be/?p=robotics/orocos_kinematics_dynamics.git;a=commit;h=927d1a0ac596482ef9d76565ebd1f566e699d319.

I had to update these lines to compile rtt_geometry successfully in hydro.