[Issue 16289] no extern(C++) mangling for size_t/unsigned long parameters

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16289

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
Sometimes I just make the C++ function `extern "C"` and that works.

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