Add recipe for bchlib package

[IsakTheHacker]

• Fixes How I install bchlib pakcage #343

[mhsmith]

Thanks for the PR. To add a new package, we need a test script to verify that it works. Please do the following:

• Follow the instructions in "Testing a package" in the README.
• Push your test script to this PR.
• Post a comment saying which Python versions and ABIs you have tested.

[mhsmith]

Changing to draft until tests are ready.

[mhsmith]

Since cibuildwheel now has Android support, it would be more efficient to submit a PR to the package's own repository, like those linked at #1417 (comment). That way we can get Android wheels not just for the current version, but for all future versions too.

[IsakTheHacker]

Thanks, I saw your post in #1417 and it was just what I wanted. I will try to get Android support upstreamed for the packages I need, and maybe some more if I get good at it. However, I can't bump the minimum API level to 24 in my projects so the old way of building packages will still be relevant to me for the foreseeable future (except if support for API level 21 was upstreamed into Python)

[mhsmith]

For the minimum API level question, see #1375 (comment).

This PR has been open for 2 years without ever being ready to test, so I'll close it now.