[Issue 22553] ImportC: undefined identifier `__uint128_t`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22553

--- Comment #3 from Walter Bright <bugzilla at digitalmars.com> ---
Yeah, having a fake type should do it. But it should be a typedef, not a
#define.

It's pretty certain that when dmd forks the preprocessor, it needs to insert
some definitions at the beginning of it. I don't think there's any other
reasonable way to support the variety of C extensions out there.

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