gimp: enable strictDeps and structuredAttrs (#526359)

pkgs/applications/graphics/gimp/default.nix

@@ -129,6 +129,7 @@ stdenv.mkDerivation (finalAttrs: {
     libxslt # for xsltproc
     gobject-introspection
     perl
+    python
     vala
 
     # for docs
@@ -222,6 +223,8 @@ stdenv.mkDerivation (finalAttrs: {
     gexiv2
   ];
 
+  strictDeps = true;
+
   mesonFlags = [
     "-Dbug-report-url=https://github.com/NixOS/nixpkgs/issues/new"
     "-Dicc-directory=/run/current-system/sw/share/color/icc"
@@ -335,6 +338,8 @@ stdenv.mkDerivation (finalAttrs: {
     gtk = gtk3;
   };
 
+  __structuredAttrs = true;
+
   meta = {
     description = "GNU Image Manipulation Program";
     homepage = "https://www.gimp.org/";