debootstrap: add wget also to PATH

pkgs/tools/misc/debootstrap/default.nix

···
     sha256 = "1gq5r4fa0hrq4c69l2s0ygnfyvr90k2wqaq15s869hayhnssx4g1";
   };
 
-  buildInputs = [ dpkg gettext gawk perl ];
+  buildInputs = [ dpkg gettext gawk perl wget ];
 
   dontBuild = true;
 
···
         --subst-var-by id "$(type -p id)" \
         --subst-var-by perl "$(type -p perl)" \
         --subst-var-by uname "$(type -p uname)" \
-        --subst-var-by wget "${wget}/bin/wget"
+        --subst-var-by wget "$(type -p wget)"
     done