spotify: unbreak it

Spotify doesn't start:

$ ./result/bin/spotify
/nix/store/yx05s6irqil8a24ilyvjvhnjljmm8f15-spotify-0.9.4.183/bin/.spotify-wrapped: error while loading shared libraries: libcef.so: cannot open shared object file: No such file or directory

That is fixed with adding $out/spotify-client/Data to RPATH.

Then Spotify errors out trying to open libudev.so.0. We don't have that
in nixpkgs, so I'm making a symlink to libudev.so.1 instead.

Tested on NixOS x86_64-linux.