Remove with helperFunction above the list of all packages.

This modification change the names bound to the `helperFunctions` attribute
set, to be bound to `self` which is constructed by merging the same
`helperFunctions` set with the set of all packages.

This patch works as expected because none of the helperFunction names is
aliased by the name of a package.

pkgs/top-level/all-packages.nix

@@ -131,7 +131,7 @@ let
       stdenvAdapters =
         import ../stdenv/adapters.nix pkgs;
 
-      self_ = with self; helperFunctions // (with helperFunctions; {
+      self_ = with self; helperFunctions // {
 
   # Make some arguments passed to all-packages.nix available
   inherit system platform;
@@ -16468,7 +16468,7 @@ let
 
   mg = callPackage ../applications/editors/mg { };
 
-}); # self_ =
+}; # self_ =
 
 
 aliases = import ./aliases.nix self;