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Supress warnings about nodiscard in dictionary generation with ROOT 6.22

Christoph Hasse requested to merge suppress_cling_nodiscard_warning into master

Introduce small change to gaudi_add_dictionary

  • if ROOT 6.22 then add -Wno-unknown-attributes to suppress warning about nodiscard attribute in c++ library headers

for example of warning see e.g. here

cc @rmatev @clemenci

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