[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 #6 from j...@red.email.ne.jp ---
Aaaaaand MORE:

https://github.com/dlang/druntime/pull/1575

About SIZE_T's, I did the same routine (detect and replace).
They are much less than above.

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