Since "Use override" (3985f2a0) kconfig_compiler.cpp
generates usrSave with override instead of Q_DECL_OVERRIDE. This causes
the KConfigCompiler_Test to fail [1], as the reference file of the test
was not updated.
[1]: https://build.kde.org/job/Frameworks%20kconfig%20kf5-qt5%20SUSEQt5.10/32/