WIP:Remove GAUDI_V20_COMPAT, HAVE_GAUDI_PLUGINSVC and ATLAS_GAUDI_V21 flags, fix for ATLINFR-1086

Stewart Martin-Haughrequested to merge
smh/atlasexternals:build_flags into master

Fairly trivial, but GAUDI_V20_COMPAT is no longer used in master so it can be removed from the AthenaExternals build flags.

The HAVE_GAUDI_PLUGINSVC and ATLAS_GAUDI_V21 flags are still used but I am tackling this in https://gitlab.cern.ch/atlas/athena/merge_requests/8424

Cheers,

Stewart

Edited by Frank Winklmeier

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