Merge pull request #39503 from veprbl/pr/sacrifice_darwin_fix

sacrifice: fix runtime on darwin

pkgs/applications/science/physics/sacrifice/default.nix

···
     "--with-pythia=${pythia}"
   ];
 
+  postInstall = stdenv.lib.optionalString stdenv.isDarwin ''
+    install_name_tool -add_rpath ${pythia}/lib "$out"/bin/run-pythia
+  '';
+
   enableParallelBuilding = true;
 
   meta = {