Add importlib-metadata dependency

[johnflavin]

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

Fixes #114

[conda-forge-linter]

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

I wanted to let you know that I linted all conda-recipes in your PR (recipe) and found some lint.

Here's what I've got...

For recipe:

• noarch packages can't have selectors. If the selectors are necessary, please remove noarch: python.

[conda-forge-linter]

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

I wanted to let you know that I linted all conda-recipes in your PR (recipe) and found some lint.

Here's what I've got...

For recipe:

• Non noarch packages should have python requirement without any version constraints.

[conda-forge-linter]

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 (recipe) and found it was in an excellent condition.

[jakirkham]

Looks good. Thanks John! 😄

Had one small suggestion below

[jakirkham]

As we don't build for anything older than Python 3.6, this can be dropped

[jakirkham]

Suggested change

skip: true # [py<36]

[bollwyvl]

/Users/runner/miniforge3/conda-bld/sphinx_1642628795584/work/conda_build.sh: line 4: /Users/runner/miniforge3/conda-bld/sphinx_1642628795584/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_pl/bin/python: Bad CPU type in executable

That ickiness aside, dropping noarch seems like a heavy price to pay... i've opened #116 as an alternative. it appears they are just using the entry_points reader. it won't be strictly accurate, but also won't fail, either...

[bollwyvl]

note, this replaces setuptools, so that can be removed below... c/f sphinx-doc/sphinx#10007

[johnflavin]

dropping noarch seems like a heavy price to pay

I agree. I'm not really a fan of dropping noarch and adding a lot more complexity to the build. Which, incidentally, is failing at the moment because I don't have a good grasp of all the build configurations that need to be set. (Clearly the configurations I yoinked from matplotlib's feedstock aren't all working.) Plus there isn't even a build for 3.10, which I would have expected.

I'm going to close this for now in favor of #116.

[jakirkham]

Thanks for working on this John! 😄