Reproducible builds of pyproject projects using pip is resolved.
Fixes https://github.com/pypa/pip/issues/7808
Fixes https://github.com/NixOS/nixpkgs/issues/81441
The more recent c409f694807e8cd16db8e2affb630073c1aadc48 caused trouble
with pyproject troubles and had to be reverted anyway.
https://github.com/NixOS/nixpkgs/pull/102222#issuecomment-722380794
Revert "pythonPackages.pip: make reproducible (#102222)"
This reverts commit c409f694807e8cd16db8e2affb630073c1aadc48.
Revert "python3Packages.pip: allow setting reproducible temporary directory via NIX_PIP_INSTALL_TMPDIR"
This reverts commit aedbade43e615d7893d268632f5e7f2570fd3233.