add patch fixing GenericAlias on 3.9

[mattip]

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 incompatibility with types.GenericAlias, discovered in the numpy-feedstock conda-forge/numpy-feedstock#263 and fixed in https://foss.heptapod.net/pypy/pypy/-/issues/3720

Also refactored an import of inspect in _ctypes to avoid importing too many other modules. This came up in a name clash where gobject-introspection has its own ast module that clashes with the stdlib one.

[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.

[mattip]

@conda-forge-admin, please rerender

[mattip]

CI is passing. Could someone review?

[lithomas1]

Unrelated, but can you also delete the pre-7.3.9 patches? I forgot to do that in my other PR. Thanks.

[mattip]

delete the pre-7.3.9 patches

Done

[mattip]

Once this gets merged, I can rebuild the aarch64 and ppc packages on the gcc buildfarm. @isuruf once I do that how do I upload them?

[isuruf]

You can upload to your own channel and I can copy it. Can you keep the logs of building the package?
Btw, I can give you access to our machines. Otherwise you'll have to make sure to use docker or start with a clean CentOS 7 VM.

[mattip]

Access would be nice. I sent you a mail with my details

[mattip]

@isuruf I have uploaded the aarch64 and ppc64le packages to https://anaconda.org/mattip and attached the logs.txt files.
logs_aarch64.txt
logs_ppc64le.txt

The commands I used (slightly modified your recommendations) are at https://gist.github.com/mattip/1cb3c04fe1c285f62dfb4884cc1c5f22