Snippets for airspyhf 1.6.8 from Alpine riscv64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-riscv64/community/airspyhf/airspyhf-1.6.8-r2.log.

• /home/buildozer/aports/community/airspyhf/src/airspyhf-1.6.8/tools/src/airspyhf_rx.c:702:25: warning: dangling pointer 'path_177' to 'path_file' may be used [-Wdangling-pointer=]
    702 |                         perror (path);
        |                         ^~~~~~~~~~~~~