[Bug libstdc++/65018] Use secure_getenv when available

[howunijemu at crypemail dot info]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65018

dnahrblock <howunijemu at crypemail dot info> changed:

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                 CC|                            |howunijemu at crypemail dot info

--- Comment #2 from dnahrblock <howunijemu at crypemail dot info> ---
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