Snippets for plasma-systemmonitor 6.7.5 from Alpine riscv64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-riscv64/community/plasma-systemmonitor/plasma-systemmonitor-6.7.5-r0.log.

• /home/buildozer/aports/community/plasma-systemmonitor/src/plasma-systemmonitor-6.7.5/src/main.cpp:96:10: warning: unused variable 'sessionManager' [-Wunused-variable]
     96 |     auto sessionManager = new SessionManager(&app);
        |          ^~~~~~~~~~~~~~