Backport of "overlay/example: added qt core dependency for qt overlay example" into 1.18
requested to merge tpm/gst-plugins-base:backport-mr-1020-into-1.18-fix_qt_example_core_dep into 1.18
Backport of !1020 (merged) "overlay/example: added qt core dependency for qt overlay example".
Commits:
- cdbf535f overlay/example: added qt core dependency for qt overlay example