pcre2: __structuredAttrs, strictDeps, enableParallelBuilding

`nix store make-content-addressed` gives the same output
before and after this change.

(cherry picked from commit 5985f54958)

pkgs/by-name/pc/pcre2/package.nix

@@ -17,6 +17,10 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-R/6MmUYSUNQviebo/a66naBXhV0G63/AjZygP9CNe8c=";
   };
 
+  __structuredAttrs = true;
+  strictDeps = true;
+  enableParallelBuilding = true;
+
   nativeBuildInputs = [ updateAutotoolsGnuConfigScriptsHook ];
 
   configureFlags = [