[PATCH] libsanitizer: use gnu++14

[Martin Liška]

Hi.

Thank you for the report. It's caused by fact that LLVM switch in 4d474e078ac7
to c++14. So that I suggest to use gnu++14.

Patch can bootstrap on x86_64-linux-gnu and survives regression tests.
I also verified that abidiff is equal for all libsanitizer shared libraries.
I'm going to install the patch if there are no objections.

Thanks,
Martin
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