babl: enable strictDeps and structuredAttrs (#526301)

pkgs/by-name/ba/babl/package.nix

@@ -31,6 +31,10 @@ stdenv.mkDerivation (finalAttrs: {
     ./dev-prefix.patch
   ];
 
+  depsBuildBuild = [
+    pkg-config
+  ];
+
   nativeBuildInputs = [
     meson
     ninja
@@ -44,6 +48,8 @@ stdenv.mkDerivation (finalAttrs: {
     lcms2
   ];
 
+  strictDeps = true;
+
   mesonFlags = [
     "-Dprefix-dev=${placeholder "dev"}"
     # On Linux, this would be disabled by default but we have -Dauto_features=enabled.
@@ -61,6 +67,8 @@ stdenv.mkDerivation (finalAttrs: {
     moveToOutput "share/doc" "$devdoc"
   '';
 
+  __structuredAttrs = true;
+
   meta = {
     description = "Image pixel format conversion library";
     mainProgram = "babl";