[Issue 21974] importC: Error: undefined identifier '__builtin_va_list'

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21974

--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject.org> ---
Current workaround is to add `typedef` declarations in the "wrapper" sources.

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