Necessary warning suppressions for compiling MITK using Qt 5.15
Summary: Suppress a few blueberry warnings to enable compilation with Qt 5.15
Test Plan: CI
Reviewers: O3 MITK Reviewer Group II!, O1 MITK Reviewer Group I!
Subscribers: kislinsk
Maniphest Tasks: T28283
Differential Revision: https://phabricator.mitk.org/D469