What happens if MySQL is enabled for macOS?

[rschu1ze]

Addresses #21191

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Enable MySQL/MariaDB on macOS. This closes #21191.

[alexey-milovidov]

What has happened?

[robot-ch-test-poll4]

This is an automated comment for commit 59cbae8 with description of existing statuses. It's updated for the latest CI running

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Check name	Description	Status
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[rschu1ze]

Thanks a lot for finishing this.

[alexey-milovidov]

My pleasure!

The only remaining question is whether it will run on typical configurations. Because I've added a dependency on iconv's dylib. On Linux, it is part of libc, but on Mac, it is a separate library. Most likely, it is installed most of the time, but I'm not sure.