[Issue 20688] Wrong code when linking to C complex number functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20688

--- Comment #4 from Walter Bright <bugzilla at digitalmars.com> ---
It works correctly when I try it with master. Perhaps this is because I have
fixed other bugs regarding structs in the meantime.

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