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Set C++17 for GCC 7 and above, in line with LCG

Stewart Martin-Haugh requested to merge smh/atlasexternals:CXX_17_for_GCC7 into master

Hi,

Since a few people now hit the issue that their local GCC8 compilation doesn't work unless they specify CMAKE_CXX_STANDARD=17, I thought it was best to enable this for GCC 7 and above directly.

Once we drop GCC 6.2 we can remove this logic.

Work related to ATLINFR-2384

Cheers,

Stewart

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