[Issue 23701] ImportC: __int64 is not documented as supported Visual C extension

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23701

--- Comment #5 from Walter Bright <bugzilla at digitalmars.com> ---
(In reply to Iain Buclaw from comment #4)
> (In reply to Walter Bright from comment #3)
> > I take that back. importc.h has a #define for it:
> > 
> >     #define __int64 long long
> Should we be testing for things defined in `importc.h` then? :-)

We already do, but they are kinda sprinkled in among the .c and .i tests.

Not really sure if they should be documented with the compiler or not.

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