mctc-lib: fix openmp cores in checkPhase (#442441)

pkgs/by-name/cp/cp2k/package.nix

···
   grimmeCmake = lib.makeScope newScope (self: {
     mctc-lib = mctc-lib.override {
       buildType = "cmake";
-      inherit (self) jonquil toml-f;
+      inherit (self) jonquil;
     };
 
     toml-f = toml-f.override {

pkgs/by-name/df/dftd4/package.nix

···
   stdenv,
   lib,
   fetchFromGitHub,
-  fetchpatch,
   gfortran,
   buildType ? "meson",
   cmake,

pkgs/by-name/mc/mctc-lib/package.nix

···
   cmake,
   pkg-config,
   python3,
-  toml-f,
   jonquil,
 }:
 
···
   ];
 
   doCheck = true;
+
+  preCheck = ''
+    export OMP_NUM_THREADS=2
+  '';
 
   postPatch = ''
     patchShebangs --build config/install-mod.py

pkgs/by-name/si/sirius/package.nix

···
 ];
 assert enablePython -> pythonPackages != null;
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "SIRIUS";
   version = "7.8.0-unstable-2025-07-23";
 

pkgs/development/libraries/science/chemistry/tblite/python.nix

···
 {
-  lib,
   buildPythonPackage,
   meson,
   ninja,