Incompatible with Python 3.13

[treiher]

If Python 3.13 is used, building this crate fails:

  thread 'main' panicked at /home/tr/.cargo/registry/src/index.crates.io-6f17d22bba15001f/gpr-0.1.4/build.rs:74:9:
  failed to run command: ../target/debug/build/gpr-2bb0245cd076a372/out/contrib/gpr/langkit/manage.py
  Traceback (most recent call last):
    File "../target/debug/build/gpr-2bb0245cd076a372/out/contrib/gpr/langkit/manage.py", line 12, in <module>
      from langkit.libmanage import ManageScript
    File "../target/debug/build/gpr-2bb0245cd076a372/out/contrib/langkit/langkit/libmanage.py", line 12, in <module>
      import pipes
  ModuleNotFoundError: No module named 'pipes'

The used version of Langkit depends on a feature that has been removed in Python 3.13 (see AdaCore/langkit#658).

[jklmnn]

Apparently langkit is no longer required to build gpr2 so I have removed it entirely from the build process. Can you check that #12 works for you?

[treiher]

#12 works for me. Thanks for fixing the issue, and sorry for the late reply!