gnome3: remove versionBranch attribute

Standard library now contains stdenv.lib.versions.majorMinor,
which does the same.

pkgs/applications/misc/orca/default.nix

@@ -1,4 +1,4 @@
-{ lib, pkgconfig, fetchurl, buildPythonApplication
+{ stdenv, pkgconfig, fetchurl, buildPythonApplication
 , autoreconfHook, wrapGAppsHook, gobjectIntrospection
 , intltool, yelp-tools, itstool, libxmlxx3
 , python, pygobject3, gtk3, gnome3, substituteAll
@@ -7,7 +7,6 @@
 , speechd, brltty, setproctitle, gst_all_1, gst-python
 }:
 
-with lib;
 let
   pname = "orca";
   version = "3.28.2";
@@ -17,7 +16,7 @@ in buildPythonApplication rec {
   format = "other";
 
   src = fetchurl {
-    url = "mirror://gnome/sources/${pname}/${gnome3.versionBranch version}/${name}.tar.xz";
+    url = "mirror://gnome/sources/${pname}/${stdenv.lib.versions.majorMinor version}/${name}.tar.xz";
     sha256 = "08rh6ji680g5nrw2n7jrxrw7nwg04sj52jxffcfasgss2f51d38q";
   };
 
@@ -54,7 +53,7 @@ in buildPythonApplication rec {
     };
   };
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://wiki.gnome.org/Projects/Orca;
     description = "Screen reader";
     longDescription = ''