python3Packages.lexid: disable lib3to6 usage to fix build

pkgs/development/python-modules/lexid/default.nix

@@ -9,6 +9,12 @@ buildPythonPackage rec {
     sha256 = "509a3a4cc926d3dbf22b203b18a4c66c25e6473fb7c0e0d30374533ac28bafe5";
   };
 
+  prePatch = ''
+    # Disable lib3to6, since we're only building this on 3.6+ anyway.
+    substituteInPlace setup.py \
+      --replace 'if any(arg.startswith("bdist") for arg in sys.argv):' 'if False:'
+  '';
+
   propagatedBuildInputs = [ click ];
 
   checkInputs = [ pytestCheckHook ];