Revert "Remove obsolete jackaudio version 1."

This reverts commit bdb77826d9.

Jack1 is not obsolete and neither jack1 nor jack2 is called 'jackaudio'.

Q: What's the difference between Jack1 and Jack2?
A: http://trac.jackaudio.org/wiki/Q_differenc_jack1_jack2

pkgs/applications/audio/mhwaveedit/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, SDL , alsaLib, gtk, jackaudio, ladspaH
+{ stdenv, fetchurl, SDL , alsaLib, gtk, jack2, ladspaH
 , ladspaPlugins, libsamplerate, libsndfile, pkgconfig, pulseaudio }:
 
 stdenv.mkDerivation  rec {
@@ -11,7 +11,7 @@ stdenv.mkDerivation  rec {
   };
 
   buildInputs =
-   [ SDL alsaLib gtk jackaudio ladspaH libsamplerate libsndfile
+   [ SDL alsaLib gtk jack2 ladspaH libsamplerate libsndfile
      pkgconfig pulseaudio
    ];