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High Sierra Updates, 1.0 branch (2017.10.02.)

Attila Krasznahorkay requested to merge akraszna/atlasexternals:HighSierraUpdates-1.0-20170929 into 1.0

The update fixes a number of build issues in ROOT v6.08/06 with Apple's latest Xcode/clang 9.0. Luckily the changes could be done in a backwards compatible manner, making it possible to keep using the same ROOT version for the analysis releases that we've used so far. (Not making it necessary to either update to a different LCG release with AthAnalysisExternals, or to use different versions of ROOT between AnalysisBaseExternals and AthAnalysisExternals.)

While testing the updates on Ubuntu 16.04 and 17.04, I also came across a configuration error in LWTNN that I missed before.

Tagging @jwsmith, @dguest and @will as people who may be interested...

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