sublime3: remove GTK 2 support

No version in the repo uses it anymore

pkgs/applications/editors/sublime/3/common.nix

@@ -1,13 +1,11 @@
 { buildVersion, x32sha256, x64sha256, dev ? false }:
 
-{ fetchurl, stdenv, xorg, glib, glibcLocales, gtk2, gtk3, cairo, pango, libredirect, makeWrapper, wrapGAppsHook
-, pkexecPath ? "/run/wrappers/bin/pkexec", gksuSupport ? false, gksu
+{ fetchurl, stdenv, xorg, glib, glibcLocales, gtk3, cairo, pango, libredirect, makeWrapper, wrapGAppsHook
+, pkexecPath ? "/run/wrappers/bin/pkexec"
 , writeScript, common-updater-scripts, curl, gnugrep
 , openssl, bzip2, bash, unzip, zip
 }:
 
-assert gksuSupport -> gksu != null;
-
 let
   pname = "sublimetext3";
   packageAttribute = "sublime3${stdenv.lib.optionalString dev "-dev"}";
@@ -18,7 +16,6 @@ let
   downloadArchiveType = "tar.bz2";
   versionUrl = "https://www.sublimetext.com/${if dev then "3dev" else "3"}";
   versionFile = "pkgs/applications/editors/sublime/3/packages.nix";
-  usesGtk2 = stdenv.lib.versionOlder buildVersion "3181";
   archSha256 =
     if stdenv.hostPlatform.system == "i686-linux" then
       x32sha256
@@ -30,9 +27,8 @@ let
     else
       "x64";
 
-  libPath = stdenv.lib.makeLibraryPath [ xorg.libX11 glib (if usesGtk2 then gtk2 else gtk3) cairo pango ];
-  redirects = [ "/usr/bin/pkexec=${pkexecPath}" ]
-    ++ stdenv.lib.optional gksuSupport "/usr/bin/gksudo=${gksu}/bin/gksudo";
+  libPath = stdenv.lib.makeLibraryPath [ xorg.libX11 glib gtk3 cairo pango ];
+  redirects = [ "/usr/bin/pkexec=${pkexecPath}" ];
 in let
   binaryPackage = stdenv.mkDerivation {
     pname = "${pname}-bin";
@@ -46,8 +42,8 @@ in let
 
     dontStrip = true;
     dontPatchELF = true;
-    buildInputs = stdenv.lib.optionals (!usesGtk2) [ glib gtk3 ]; # for GSETTINGS_SCHEMAS_PATH
-    nativeBuildInputs = [ zip unzip makeWrapper ] ++ stdenv.lib.optional (!usesGtk2) wrapGAppsHook;
+    buildInputs = [ glib gtk3 ]; # for GSETTINGS_SCHEMAS_PATH
+    nativeBuildInputs = [ zip unzip makeWrapper wrapGAppsHook ];
 
     # make exec.py in Default.sublime-package use own bash with an LD_PRELOAD instead of "/bin/bash"
     patchPhase = ''
@@ -76,7 +72,7 @@ in let
           $binary
       done
 
-      # Rewrite pkexec|gksudo argument. Note that we can't delete bytes in binary.
+      # Rewrite pkexec argument. Note that we cannot delete bytes in binary.
       sed -i -e 's,/bin/cp\x00,cp\x00\x00\x00\x00\x00\x00,g' ${primaryBinary}
 
       runHook postBuild
@@ -105,7 +101,7 @@ in let
         --set LD_PRELOAD "${libredirect}/lib/libredirect.so" \
         --set NIX_REDIRECTS ${builtins.concatStringsSep ":" redirects} \
         --set LOCALE_ARCHIVE "${glibcLocales.out}/lib/locale/locale-archive" \
-        ${stdenv.lib.optionalString (!usesGtk2) ''"''${gappsWrapperArgs[@]}"''}
+        "''${gappsWrapperArgs[@]}"
 
       # Without this, plugin_host crashes, even though it has the rpath
       wrapProgram $out/plugin_host --prefix LD_PRELOAD : ${stdenv.cc.cc.lib}/lib${stdenv.lib.optionalString stdenv.is64bit "64"}/libgcc_s.so.1:${openssl.out}/lib/libssl.so:${bzip2.out}/lib/libbz2.so