[Issue 20082] Struct with extern destructor that's never called causes link error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20082

--- Comment #9 from Manu <turkeyman at gmail.com> ---
Mmm. I could use weak linkage, feels like a massive hack though. Situation is
not-great.

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