709bddfc45
This also fixes an empty version field in pugixml's pkg-config file.
Some consumers like graphics/waylandpp refuse to use the system
pugixml because of it.
- Take maintainership
- Cleanup some things that are no longer needed
- Use CMAKE_{OFF,ON} helpers
Changes: https://pugixml.org/docs/manual.html#v1.9
ABI: https://abi-laboratory.pro/tracker/timeline/pugixml/
PR: 234779
Approved by: ybungalobill@gmail.com (maintainer)