[Issue 22341] importC: Error 'fun' called with argument types '(uint)' matches both: 'fun(ulong)' and 'fun(ulong)'

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22341

--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject.org> ---
Removing `extern` works around the error.

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