Fixes duplicate packages found when there is also an alias.
We already account for PEP518 normalization ourselves.
Traceback (most recent call last):
File "./parse-requirements.py", line 226, in <module>
main()
File "./parse-requirements.py", line 174, in main
attr_path = name_to_attr_path(name, packages)
File "./parse-requirements.py", line 142, in name_to_attr_path
assert len(attr_paths) <= 1, "{} matches more than one derivation: {}".format(
AssertionError: google-api-python-client matches more than one derivation: {'python3Packages.google_api_python_client', 'python3Packages.google-api-python-client'}
b86e821a3a