[Issue 19553] runnable/cpp_stdlib.d fails on NixOS

[d-bugmail--- via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=19553

--- Comment #5 from Thomas Mader <thomas.ma...@gmail.com> ---
A better and easier solution is to just clear the environment from the already
defined flags in the Makefile or the test runner script.

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