ora:kra: qstrcmp -> memcmp
i..e don't check strings but memory
Makes oss-fuzz happier.
Reviewers: svuorela
Reviewed By: svuorela
Subscribers: apol, pino, security-team, rempt, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D20143