We hope to update rust-rand to version 0.10 soon, python-cotengrust
will need a small adjustment for the new version, removing the rand
0.8 related changes and adding some minor changes for rand 0.10.

While working on the update, I noticed a couple of other issues,
firstly the clean target was broken. Secondly the pyo3 related
changes in "002-fix-rand-PyO3-api.patch" fix the build with 0.25
but break it with 0.28. Since debian currently has 0.27 and will
probablly update to 0.28 at some time in the not too distant
future I think these changes have outlived their usefulness.