[hrpsys_ros_bridge_tutorials] Enable to compile on pure Ubuntu Focal

[pazeshun]

Currently, building hrpsys_ros_bridge_tutorials on pure Ubuntu Focal fails due to the following errors:

/usr/bin/env: ‘python’: No such file or directory
make[2]: *** [CMakeFiles/all_urdf_model_generate.dir/build.make:71: /root/hiro_ws/src/rtmros_tutorials/hrpsys_ros_bridge_tutorials/models/HRP2JSK_WH_SENSORS.urdf] Error 127
make[1]: *** [CMakeFiles/Makefile2:7527: CMakeFiles/all_urdf_model_generate.dir/all] Error 2
make: *** [Makefile:141: all] Error 2

/usr/bin/env: ‘python’: No such file or directory
make[2]: *** [CMakeFiles/all_urdf_model_generate.dir/build.make:107: /root/hiro_ws/src/rtmros_tutorials/hrpsys_ros_bridge_tutorials/models/CHIDORI_SENSORS.urdf] Error 127
make[1]: *** [CMakeFiles/Makefile2:7527: CMakeFiles/all_urdf_model_generate.dir/all] Error 2
make: *** [Makefile:141: all] Error 2

This PR fixes these errors by applying a patch similar to tork-a/openrtm_aist_python-release#5.