[Issue 24310] ImportC: varargs from Microsoft header incompatible with va_start

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24310

--- Comment #4 from Walter Bright <bugzilla at digitalmars.com> ---
I suspect it might work if we added to stdarg.d:

    void __va_start(T)(va_list* ap, ref T parmn)
    {
        va_start(*ap, parmn);
    }

and to __builtins.di:

    alias __va_start = imported!"core.stdc.stdarg".__va_start;

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