Sweeping !1627 from master to LCG_103-patches: flatbuffers: drop compiler flag that clashes on ubuntu20 gcc9.4, only add for macos (!1629) · Merge requests · sft / lcgcmake

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Sweeping !1627 from master to LCG_103-patches: flatbuffers: drop compiler flag that clashes on ubuntu20 gcc9.4, only add for macos