Add _python_rc

[0xbe7a]

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This is a dummy package to be released only in the python_rc channel. Adding this package as a dependency to a Python release candidate forces conda-build to use the python_rc channel as channel_source for Python, even with channel priority strict.

See conda-forge/conda-forge-ci-setup-feedstock#280

CC @xhochy @isuruf

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/python_rc_dummy) and found it was in an excellent condition.

[xhochy]

Happy to be a maintainer; alternatively we could also set conda-forge/python as maintainer here. I'll let @isuruf decide.