[Issue 21227] import(".\\file") doesn't work on Windows

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21227

--- Comment #4 from Dlang Bot <dlang-bot at dlang.rocks> ---
@andrey-zherikov created dlang/dmd pull request #11720 "Fix path validation in
import expression (issue #21227)" mentioning this issue:

- Fix path validation in import expression (issue #21227)

https://github.com/dlang/dmd/pull/11720

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