Revert "Handle Davix dependency introduced by Root 6.19"
This reverts commit 94e0bd8d. To be tested in lhcb-run2-patches-dev4
when the ROOT 6.22 candidate makes it there - see https://sft.its.cern.ch/jira/browse/ROOT-10520
This reverts commit 94e0bd8d. To be tested in lhcb-run2-patches-dev4
when the ROOT 6.22 candidate makes it there - see https://sft.its.cern.ch/jira/browse/ROOT-10520