Snippets for plasma-systemmonitor 6.8.0 from Fedora aarch64

Sourced from https://kojipkgs.fedoraproject.org/packages/plasma-systemmonitor/6.8.0/1.fc46/data/logs/aarch64/build.log.

• /builddir/build/BUILD/plasma-systemmonitor-6.8.0-build/plasma-systemmonitor-6.8.0/src/main.cpp:96:10: warning: unused variable ‘sessionManager’ [-Wunused-variable]
     96 |     auto sessionManager = new SessionManager(&app);
        |          ^~~~~~~~~~~~~~