[Issue 17890] cpp_long is not declared for Posix 64bit

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17890

--- Comment #3 from Walter Bright <bugzilla at digitalmars.com> ---
(In reply to Илья Ярошенко from comment #0)
> ...
> BTW, why c_long is always 32 bit for windows?

Because `long` in 64 bit VC++ is 32 bits.

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