The provisioning scripts for Mimer SQL is missing in RHEL 8.6 and
RHEL 8.8 and therefore the Mimer SQL QtSql plugin is not built
Fixes: QTBUG-111219
Pick-to: 6.6
Change-Id: I9c12b7d94ab7b047ed08b46043ad16586968ecfd
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>