[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 #1 from Vladimir Panteleev <thecybershadow at gmail.com> ---
Correction: s/cenforce/errnoEnforce/.

errnoEnforce is a public function in std.exception. We should use that where
appropriately.

cenforce is a private function declared in std.file. It needs to be replaced
with errnoEnforce.

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