guitone: remove package

Guitone isn't used in Nixpkgs anywhere. It hasn't seen a release in 11 years
(6a09974e0f) and is unmaintained in
Nixpkgs. Also it's the sole remaining user of graphviz_2_32, which
should be removed as well.

pkgs/applications/version-management/guitone/default.nix

@@ -1,34 +0,0 @@
-{ lib, stdenv, fetchmtn, qt4, qmake4Hook, pkg-config, graphviz }:
-
-let version = "1.0-mtn-head"; in
-stdenv.mkDerivation {
-  pname = "guitone";
-  inherit version;
-
-  #src = fetchurl {
-  #  url = "${meta.homepage}/count.php/from=default/${version}/${name}.tgz";
-  #  sha256 = "08kcyar6p6v5z4dq6q6c1dhyxc2jj49qcd6lj3rdn1rb9hz4n7ms";
-  #};
-
-  src = fetchmtn {
-    dbs = ["mtn://code.monotone.ca/guitone"];
-    selector = "3a728afdbd3943b1d86c2a249b1e2ede7bf64c27";
-    sha256 = "01vs8m00phs5pl75mjkpdarynfpkqrg0qf4rsn95czi3q6nxiaq5";
-    branch = "net.venge.monotone.guitone";
-  };
-
-  patches = [ ./parallel-building.patch ];
-
-  nativeBuildInputs = [ pkg-config ];
-  buildInputs = [ qt4 qmake4Hook graphviz ];
-
-  qmakeFlags = [ "guitone.pro" ];
-
-  meta = {
-    description = "Qt4 based GUI for monotone";
-    homepage = "https://guitone.thomaskeller.biz";
-    downloadPage = "https://code.monotone.ca/p/guitone/";
-    license = lib.licenses.gpl3;
-    inherit (qt4.meta) platforms;
-  };
-}

pkgs/applications/version-management/guitone/parallel-building.patch

@@ -1,7 +0,0 @@
-Without this `make tmp/AttributesView.o` fails with
-src/view/dialogs/AddEditAttribute.h:22:35: fatal error: ui_add_edit_attribute.h: No such file or directory
---- a/guitone.pro
-+++ b/guitone.pro
-@@ -215 +215,2 @@ help.commands = @echo Available targets: $${QMAKE_EXTRA_TARGETS}
- QMAKE_EXTRA_TARGETS += help
-+CONFIG += depend_includepath

pkgs/top-level/all-packages.nix

@@ -25672,10 +25672,6 @@ with pkgs;
 
   guardian-agent = callPackage ../tools/networking/guardian-agent { };
 
-  guitone = callPackage ../applications/version-management/guitone {
-    graphviz = graphviz_2_32;
-  };
-
   gv = callPackage ../applications/misc/gv { };
 
   gvisor = callPackage ../applications/virtualization/gvisor {