Add a python3-dev dependency to tf2_py. #733
Merged
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This is needed because it depends on Python.h being available, and it also calls find_package(Python3 Development).
While we are in here, we also remove "Development" from the find_package(Python3) calls in tf2_geometry_msgs and tf2_sensor_msgs. In both of those cases, we only need the interpreter, not the header files.
Also see ros2/ros2_tracing#146 (comment) for a long explanation of why we need this.