octave-packages: switch to using makeScope for all octave packages

This allows packages to declare other octave package dependencies in
their respective definitions, and when added here, they are implicitly
passed.

In response to:
NixOS#108562 (comment)

pkgs/top-level/octave-packages.nix

@@ -20,25 +20,21 @@
 , nettle
 }:
 
-let
+with lib;
 
-  isOctaveFull = octave.enableQt;
-  isOctaveJIT = octave.enableJIT;
+makeScope newScope (self:
+  let
+    callPackage = self.callPackage;
 
-  buildOctaveLibrary = callPackage ../development/interpreters/octave/mk-octave-derivation.nix {
-    inherit pkgs lib stdenv;
-    namePrefix = "${octave.pname}-${octave.version}";
-    inherit octave;
-  };
+    buildOctaveLibrary = callPackage ../development/interpreters/octave/mk-octave-derivation.nix {
+      inherit pkgs lib stdenv;
+      namePrefix = "${octave.pname}-${octave.version}";
+      inherit octave;
+    };
 
-  callPackage = pkgs.newScope {
-    inherit (pkgs) lib stdenv;
-    inherit buildOctaveLibrary;
-    inherit fetchurl;
-    inherit gnuplot texinfo;
-  };
+  in {
 
-in rec {
+    inherit callPackage buildOctaveLibrary;
 
   control = callPackage ../development/octave-modules/control {
     gfortran = gfortran;
@@ -88,4 +84,4 @@ in rec {
     ]));
   };
 
-}
+  })