[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 #4 from Iain Buclaw <ibuclaw at gdcproject.org> ---
(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? :-)

At best, they should all be in a clearly named test file so that it's obvious
we're not actually testing ImportC, but rather our druntime-defined header.

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