[Issue 23614] ImportC: __int128 not supported

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23614

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
Do you really need this function, or is it just something in the header? Does
the header have an #if alternative path in it?

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