wf-config: fix and enable strictDeps

  nativeCheckInputs = [

    cmake

  ];

  checkInputs = [

    doctest

  ];

  # CMake is just used for finding doctest.

  dontUseCmakeConfigure = true;

  strictDeps = true;

  mesonFlags = [

    (lib.mesonEnable "tests" (stdenv.buildPlatform.canExecute stdenv.hostPlatform))

  ];