New review comment by paper42 on void-packages repository

https://github.com/void-linux/void-packages/pull/32905#discussion_r708436977

Comment:
pip is used to install packages that are missing. This means the environment in which the tests will run will **not** be similar to when a user installs this package, so it's useless to run tests like this. We should either specify the check dependencies in `$checkdepends` or disable tests.

In this case, if we add
```sh
checkdepends="python3-pytest $depends"
```
it will fail with
```
ImportError while loading conftest '/builddir/httpie-2.5.0/tests/conftest.py'.
tests/conftest.py:3: in <module>
    from pytest_httpbin import certs
E   ModuleNotFoundError: No module named 'pytest_httpbin'
```

pytest_httpbin is not packaged, let's disable tests and add a comment about this, so if we package it in the future, we can enable tests:

```sh
make_check=no # needs pytest_httpbin which is not packaged
```