gimp: Fix crash without dot

GEGL 0.4.28 started marking introspect action as unavailable when dot is not present.
But GIMP previously required the action to be present at startup, even though it was only ever used in dev builds.
Let’s apply an upstream patch that removes this strict requirement.

pkgs/applications/graphics/gimp/default.nix

@@ -1,6 +1,7 @@
 { stdenv
 , lib
 , fetchurl
+, fetchpatch
 , substituteAll
 , autoreconfHook
 , pkg-config
@@ -72,6 +73,12 @@ in stdenv.mkDerivation rec {
     # Use absolute paths instead of relying on PATH
     # to make sure plug-ins are loaded by the correct interpreter.
     ./hardcode-plugin-interpreters.patch
+
+    # Fix crash without dot.
+    (fetchpatch {
+      url = "https://gitlab.gnome.org/GNOME/gimp/-/commit/f83fd22c4b8701ffc4ce14383e5e22756a4bce04.patch";
+      sha256 = "POuvBhOSStO7hBGp4HgNx5F9pElFRoqN3W+i3u4zOnk=";
+    })
   ];
 
   nativeBuildInputs = [