nixos/i18n/input-method: disallow gtk{2,3}.dev in closure

The gtk-query-immodules-{2,3}.0 util writes argv[0] to its stdout
in a comment (i.e., "# Created by ..."). This results in a reference to
pkgs.gtk{2,3}.dev being present in the closure.

This commit avoids this issue by adding the pkgs.gtk{2,3}.dev to path
and calling gtk-query-immodules-{2,3}.0 without its full path.

Furthermore, pkgs.gtk{2,3}.dev is added to disallowedReferences to avoid
future regressions.

(cherry picked from commit 778f1c6575)

nixos/modules/i18n/input-method/default.nix

@@ -23,11 +23,16 @@ let
         allowSubstitutes = false;
         buildInputs = [
           cfg.package
+          pkgs.gtk2
+        ];
+
+        disallowedReferences = [
+          (lib.getDev pkgs.gtk2)
         ];
       }
       ''
         mkdir -p $out/etc/gtk-2.0/
-        GTK_PATH=${cfg.package}/lib/gtk-2.0/ ${pkgs.stdenv.hostPlatform.emulator pkgs.buildPackages} ${lib.getExe' pkgs.gtk2.dev "gtk-query-immodules-2.0"} > $out/etc/gtk-2.0/immodules.cache
+        GTK_PATH=${cfg.package}/lib/gtk-2.0/ ${pkgs.stdenv.hostPlatform.emulator pkgs.buildPackages} gtk-query-immodules-2.0 > $out/etc/gtk-2.0/immodules.cache
       '';
 
   gtk3_cache =
@@ -37,11 +42,16 @@ let
         allowSubstitutes = false;
         buildInputs = [
           cfg.package
+          pkgs.gtk3
+        ];
+
+        disallowedReferences = [
+          (lib.getDev pkgs.gtk3)
         ];
       }
       ''
         mkdir -p $out/etc/gtk-3.0/
-        GTK_PATH=${cfg.package}/lib/gtk-3.0/ ${pkgs.stdenv.hostPlatform.emulator pkgs.buildPackages} ${lib.getExe' pkgs.gtk3.dev "gtk-query-immodules-3.0"} > $out/etc/gtk-3.0/immodules.cache
+        GTK_PATH=${cfg.package}/lib/gtk-3.0/ ${pkgs.stdenv.hostPlatform.emulator pkgs.buildPackages} gtk-query-immodules-3.0 > $out/etc/gtk-3.0/immodules.cache
       '';
 
 in