setools: 4.2.0 -> 4.2.2 and fixing build

The build was broken because meanwhile setools requires cython
and no bison, swig and flex anymore.

Also, bumping version to newest release, which is not directly related
to the build breakage.

(cherry picked from commit afc4110)

pkgs/os-specific/linux/setools/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, bison, flex, python3 , swig
+{ stdenv, fetchFromGitHub, python3
 , libsepol, libselinux, checkpolicy
 , withGraphics ? false
 }:
@@ -8,16 +8,16 @@ with python3.pkgs;
 
 buildPythonApplication rec {
   pname = "setools";
-  version = "4.2.0";
+  version = "4.2.2";
 
   src = fetchFromGitHub {
     owner = "SELinuxProject";
     repo = pname;
     rev = version;
-    sha256 = "1bjwcvr6rjx79cdcvaxn68bdrnl4f2a8gnnqsngdxhkhwpddksjy";
+    sha256 = "18kklv26dwm2fdjjzfflvxsq83b2svnwf4g18xq7wsfsri121a90";
   };
 
-  nativeBuildInputs = [ bison flex swig ];
+  nativeBuildInputs = [ cython ];
   buildInputs = [ libsepol ];
   propagatedBuildInputs = [ enum34 libselinux networkx ]
     ++ optionals withGraphics [ pyqt5 ];