python_bindings: sip: Use CATKIN_PACKAGE_LIB_DESTINATION instead of hardcoded lib.
python_bindings: sip: Use CATKIN_PACKAGE_LIB_DESTINATION instead of hardcoded lib.

Fixes build with libdir != lib.
https://bugs.gentoo.org/show_bug.cgi?id=561480

ros-visualization/rviz,ros-visualization/rviz,ros-visualization/rviz,ros-visualization/rviz,ros-visualization/rviz