Building librespot for Raspotify

Podcasts do not work with the current build of librespot with Raspotify. Build the latest release and replace the binary.

apt-get install cargo build-essential libasound2-dev
cargo install librespot --branch dev --force --features alsa-backend
systemctl stop raspotify
cp /usr/bin/librespot /usr/bin/librespot.bak
chmod +x /root/.cargo/bin/librespot
ln /root/.cargo/bin/librespot /usr/bin/librespot
systemctl start raspotify