Add name mapping for 'libzmq' to 'zeromq'.
Add name mapping for 'libzmq' to 'zeromq'.

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