Fix Issue 21501 - undefined identifier in package when using mixin an…

[BorisCarvajal]

…d cyclic imports

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	21501	regression	[REG 2.089.1] undefined identifier in package when using mixin and cyclic imports

⚠️⚠️⚠️ Warnings ⚠️⚠️⚠️

• Regression or critical bug fixes should always target the stable branch. Learn more about rebasing to stable or the D release process.

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Testing this PR locally

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dub run digger -- build "master + dmd#12074"

[thewilsonator]

This is a regression please target stable.

[BorisCarvajal]

This is a regression please target stable.

Strictly speaking it never worked, it just happens that in one point release interval (because a change to mixin) the code using the mixins case compiled.
And as I commented in bugzilla, the bug is not related to mixin but any DotExpression.

[thewilsonator]

OK