Snippets for airspyhf 1.8.1 from Nix x86_64-linux

Sourced from https://hydra.nixos.org/log/d9zxi8bcdygvsqp8irvcc75v2x34shky-airspyhf-1.8.1.drv.

• /build/source/tools/src/airspyhf_rx.c:702:25: warning: dangling pointer 'path' to 'path_file' may be used [-Wdangling-pointer=]
    702 |                         perror (path);
        |                         ^~~~~~~~~~~~~