New comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/27082#issuecomment-755411270

Comment:
I have rolled this into some other updates and will merge soon. The `python3-matplotlib` tests are problematic for several reasons:
- The `PYTHONPATH` would need to be set to find compiled extensions, which is the source of the failure here.
- If you set `PYTHONPATH` to include `build/lib*` where the compiled extensions are, the `matplotlib` module does not include the baseline images needed for the tests.
- Copying the shared objects from `build/lib*` to the corresponding directories of `lib` and setting `PYTHONPATH=lib` allows the tests to run.

Unfortunately, `matplotlib` tests are evaluated by comparing output images to baseline images produced upstream, which is incredibly fragile because of differences in fonts and layout. Just disabling the tests is the right thing to do here.

Of course, if you're disabling tests, there is no value in pulling in `checkdepends`, so I've dropped that change.