./pants export :: breaks in example-python with 2.11.x

[stuhood]

Describe the bug
In pantsbuild/example-python#100, with either lockfile format, ./pants export :: renders the following error:

  File "/Users/stuhood/.pex/installed_wheels/81c06b5d43e95626f8e7265d8d9bc14ffa7e43206ab96e13882aad4c45dbe099/pex-2.1.80-py2.py3-none-any.whl/pex/environment.py", line 492, in resolve
    for fingerprinted_distribution in self.resolve_dists(all_reqs)
  File "/Users/stuhood/.pex/installed_wheels/81c06b5d43e95626f8e7265d8d9bc14ffa7e43206ab96e13882aad4c45dbe099/pex-2.1.80-py2.py3-none-any.whl/pex/environment.py", line 516, in resolve_dists
    for qualified_req_or_not_found in self._root_requirements_iter(reqs):
  File "/Users/stuhood/.pex/installed_wheels/81c06b5d43e95626f8e7265d8d9bc14ffa7e43206ab96e13882aad4c45dbe099/pex-2.1.80-py2.py3-none-any.whl/pex/environment.py", line 457, in _root_requirements_iter
    raise ResolveError(message)
pex.environment.ResolveError: A distribution for setuptools could not be resolved in this environment.Found 1 distribution for setuptools that do not apply:
1.) The wheel tags for setuptools 56.2.0 are py3-none-any which do not match the supported tags of /Users/stuhood/.pyenv/versions/2.7.17/bin/python2.7:
cp27-cp27m-macosx_10_16_x86_64
cp27-cp27m-macosx_10_16_intel

<snip long list of tags>

14:31:34.47 [ERROR] 1 Exception encountered:

  ExportError: Failed to write virtualenv for the resolve 'python-default' (using CPython==3.7.*) to dist/export/python/virtualenvs/python-default

Pants version
2.11.0rc5 (2.10.0 works)

OS
macOS

[stuhood]

cc @benjyw

[benjyw]

I don't repro this.
But I do wonder why your error message mentions your pyenv-installed python 2.7?

[stuhood]

Confirmed that #15294 fixes this for me. Thanks!