setup.[c]sh: add MARIADB_PLUGIN_DIR for the mariadb / mysql client to find plugin libraries

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added alsoTargeting:LCG_107-patches label

added test-needed label

added 4 commits

• 6bd7e21c...d6a166ed - 3 commits from branch master
• efb641f6 - setup.[c]sh: add MARIADB_PLUGIN_DIR for the mariadb / mysql client to find plugin libraries

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merged

mentioned in commit 7f1e357a

added sweep:done label

picked the changes into the branch cherry-pick-7f1e357af-LCG_107-patches with commit fcd7afe8

mentioned in commit fcd7afe8

Sweep summary

Sweep ran in https://gitlab.cern.ch/sft/lcgcmake/-/jobs/53017853
Successful:

• LCG_107-patches

mentioned in merge request !2858 (merged)

mentioned in commit 6930d13c