[Issue 13172] optimize and rawread cause symbol undefined errors

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13172

--- Comment #2 from maarten <maartenvd1994 at gmail.com> ---
commenting out the line with errnoEnforce in std/stdio.d fixes my problems (but
probably breaks a few things). It's not worthy of a patch but it's good enough
for me.

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