a821 [1] filed a deletion request for ros-melodic-angles [2]: Dead EOL package from the ROS melodic distribution.
All of these packages cannot be built anyway due to missing dependencies and/or the removal of `fix-python-scripts.sh` which used to be provided by `ros-build-tools` (removed on 2020-06-25). [1] https://aur.archlinux.org/account/a821/ [2] https://aur.archlinux.org/pkgbase/ros-melodic-angles/
