[Issue 13620] Consolidate / clean up exception types used for OS exceptions

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13620

--- Comment #2 from Vladimir Panteleev <thecybershadow at gmail.com> ---
Also, kill std.stdio.wenforce (which is private), as discussed in issue 13542.

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