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LwtnnUtils, fix clang llvm 9 on inconsistent use of struct vs class

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:LwtnnUtils_clang_warning into master

fixes

warning: 'InputOrder' defined as a struct here but previously declared as a class; this is valid, but may result in linker errors under the Microsoft C++ ABI [-Wmismatched-tags]
  struct InputOrder
  ^

As it says is valid and prb the Microsoft C++ ABI is not our main issue. In the other hand getting warnings is not nice either.

Mentioning @ssnyder who is also looking at the clang warning so as we do not overlap.

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