RFE: please allow use system installed ninja binary

[kloczek]

Please allow use system installed ninja binary instead bundled one.

[maxbachmann]

You can perform this check in your own build system and dynamically add this package as build dependency when it is not available on the system. I started to use this approach in my packages: https://github.com/maxbachmann/RapidFuzz/blob/main/_custom_build/backend.py.
This approach has been adopted by meson-python: mesonbuild/meson-python#175 and scikit-build: scikit-build/scikit-build-core#5 as well.

[eli-schwartz]

This is just a duplicate of #127 though. That issue has some of the background discussion that led to @henryiii implementing this for both scikit-build and meson-python.

(It would still be interesting to have a convenient way to pass a flag and build dummy metadata to satisfy projects that ended up with a forced ninja dependency. But that is a much lower priority.)

[henryiii]

Closing as duplicate of #127.