Pass 'with_mpd' flag to xmobar builds.
Pass 'with_mpd' flag to xmobar builds.

psibi/cabal2nix,gridaphobe/cabal2nix,Fuuzetsu/cabal2nix,bennofs/cabal2nix,jb55/cabal2nix,spencerjanssen/cabal2nix,dmalikov/cabal2nix