[Issue 17630] selective imports find symbols in private imports of other modules

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17630

--- Comment #3 from Martin Nowak <code at dawg.eu> ---
I'm going to remove the visibility deprecation anyhow. It's planned to remove
the current find & check visibility mechanism with an partially ordered
visibility one. This will allow us to merge the visibility control for import
statements with the one used for other symbols.

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