Merge pull request #23104 from dtzWill/fix/generate-shell

R/generate-shell: Use R from current tree, fix missing wget dep.

pkgs/development/r-modules/generate-shell.nix

···
-with import <nixpkgs> {};
+with import ../../.. {};
 
 stdenv.mkDerivation {
   name = "generate-r-packages-shell";
 
   buildCommand = "exit 1";
 
+  buildInputs = [ wget ];
   nativeBuildInputs = [ 
     (rWrapper.override {
       packages = with rPackages; [