[Issue 16541] Bootstrap only works with gnu++98

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16541

--- Comment #1 from Soenke <behr22 at hotmail.de> ---
I just discovered when CXX_KIND is set to g++ it's automatically defaulting to
gnu++98. This issue can closed then

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