cmus: add AudioUnit dependency

AudioUnit is required on macOS.

See ./configuration output line:
checking for COREAUDIO_LIBS (-framework CoreAudio -framework AudioUnit)... ld: framework not found AudioUnit

pkgs/applications/audio/cmus/default.nix

@@ -1,5 +1,5 @@
 { config, lib, stdenv, fetchFromGitHub, runCommand, ncurses, pkg-config
-, libiconv, CoreAudio
+, libiconv, CoreAudio, AudioUnit
 
 , alsaSupport ? stdenv.isLinux, alsaLib ? null
 # simple fallback for everyone else
@@ -121,7 +121,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [ ncurses ]
     ++ lib.optional stdenv.cc.isClang clangGCC
-    ++ lib.optionals stdenv.isDarwin [ libiconv CoreAudio ]
+    ++ lib.optionals stdenv.isDarwin [ libiconv CoreAudio AudioUnit ]
     ++ flatten (concatMap (a: a.deps) opts);
 
   makeFlags = [ "LD=$(CC)" ];

pkgs/top-level/all-packages.nix

@@ -21432,7 +21432,7 @@ in
   cmatrix = callPackage ../applications/misc/cmatrix { };
 
   cmus = callPackage ../applications/audio/cmus {
-    inherit (darwin.apple_sdk.frameworks) CoreAudio;
+    inherit (darwin.apple_sdk.frameworks) AudioUnit CoreAudio;
     libjack = libjack2;
     ffmpeg = ffmpeg_2;
   };