[Issue 13755] core.sys.linux.stdio, std.stdio.File: fopencookie, fmemopen missing

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13755

--- Comment #4 from Danny Milosavljevic <danny.milo at gmail.com> ---
(But _GNU_SOURCE is only true in core.sys.linux , so changing to that)

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