Skip re-extract ext-imap source

[crazywhalecc]

What does this PR do?

Fix #789 .

Checklist before merging

If your PR involves the changes mentioned below and completed the action, please tick the corresponding option.
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• If you modified *.php or *.json, run them locally to ensure your changes are valid:
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  • composer test
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[henderkes]

imap still seems to fail, we should probably fix it a last time, but move it into unsupported/deprecated territory.

I remember the huge pain in the ass it was to get it working in the first place, no other library was that bad

[crazywhalecc]

That's really weird, I'll have time to look into it next week. 🫠

[henderkes]

I'll leave the fun of figuring out the swoole segmentation fault to you. Imap now works again.