[Issue 17997] autotester's d_do_test has strange failures with Win32

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17997

--- Comment #1 from Walter Bright <bugzilla at digitalmars.com> ---
See https://github.com/dlang/dmd/pull/7333 for details.

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