[Issue 23330] std.experimental.logger: file logger should use OS-specific path separators on each platform

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23330

--- Comment #1 from Andrej Mitrovic <andrej.mitrovich at gmail.com> ---
I should say dir separator, not path separator. I'll fix up the issue name.

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