Merge pull request #13057 from FRidh/pyxml

pyxml: move to pythonPackages

pkgs/top-level/all-packages.nix

···
 
   pysideShiboken = pythonPackages.pysideShiboken;
 
-  pyxml = callPackage ../development/python-modules/pyxml { };
+  pyxml = pythonPackages.pyxml;
 
   rbtools = pythonPackages.rbtools;
 

pkgs/top-level/python-packages.nix

···
 
   pysideTools = callPackage ../development/python-modules/pyside/tools.nix { };
 
+  pyxml = if !isPy3k then callPackage ../development/python-modules/pyxml{ } else throw "pyxml not supported for interpreter ${python.executable}";
+
   sip = callPackage ../development/python-modules/sip { };
 
   sip_4_16 = callPackage ../development/python-modules/sip/4.16.nix { };