* Switch to the PEP517 build framework and remove py-pytest-runner as a
build time dependency while I'm here, because upstream of it has
archived the project with the following notice:
pytest-runner depends on deprecated features of setuptools and relies
on features that break security mechanisms in pip. For example
'setup_requires' and 'tests_require' bypass pip --require-hashes.
See also https://github.com/pypa/setuptools/issues/1684
* Bump PORTREVISION due package change.
5f45571141