[Issue 15959] core.sys.windows modules should be modified for x64

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15959

--- Comment #8 from jiki at red.email.ne.jp ---
#1552 #1575 was merged, thanks.

But #1574 remains. ( which has the most fixes )

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