undmg: refactor meta

  makeFlags = [ "PREFIX=$(out)" ];

  meta = with lib; {

    homepage = "https://github.com/matthewbauer/undmg";

  meta = {

    description = "Extract a DMG file";

    license = licenses.gpl3;

    platforms = platforms.all;

    maintainers = with maintainers; [

    homepage = "https://github.com/matthewbauer/undmg";

    license = lib.licenses.gpl3;

    mainProgram = "undmg";

    maintainers = with lib.maintainers; [

      matthewbauer

      lnl7

    ];

    mainProgram = "undmg";

    platforms = lib.platforms.all;

  };

}