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/jackmeter/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, jackaudio, pkgconfig }:
+{ stdenv, fetchurl, jack2, pkgconfig }:
 
 stdenv.mkDerivation rec {
   name = "jackmeter-0.4";
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "1cnvgx3jv0yvxlqy0l9k285zgvazmh5k8m4l7lxckjfm5bn6hm1r";
   };
 
-  buildInputs = [ jackaudio pkgconfig ];
+  buildInputs = [ jack2 pkgconfig ];
 
   meta = { 
     description = "Console jack loudness meter";