darwin/core: install more recent version of macos's cli tools

darwin/profiles/common/core/default.nix

@@ -48,4 +48,19 @@
     fish_add_path --move --prepend --path ${lib.concatMapStringsSep " " dquote (makeBinPathList config.environment.profiles)}
     set fish_user_paths $fish_user_paths
   '';
+
+  # Install more recent versions of some macOS tools.
+  # https://github.com/mathiasbynens/dotfiles/blob/master/brew.sh
+  environment.systemPackages = with pkgs; [
+    bashInteractive
+    coreutils
+    findutils
+    git
+    gnugrep
+    gnused
+    openssh
+    screen
+    tree
+    vim
+  ];
 }