libstdc++: Avoid illegal argument to verbose in dg-test callback
If extra_tool_flags starts with a dash, an error like 'ERROR: verbose: illegal argument: -march=native -O2 -std=c++17' is printed. This is easily fixed by inserting a double dash before the variable. 2020-04-20 Matthias Kretz <kretz@kde.org> * testsuite/lib/libstdc++.exp: Avoid illegal argument to verbose.
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