[Issue 17707] unimported modules in libraries do not have their module constructors run

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17707

--- Comment #1 from John Colvin <john.loughran.colvin at gmail.com> ---
The same behaviour is observed when the library is made with dmd, when the
linking is done with dmd, etc...

Essentially dmd seems to be doing something different with the __modctor it
gets from an object file or a library

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