maxima: use previous versions of ECL and SBCL; the tests fail with the latest versions

pkgs/top-level/all-packages.nix

···
 
   geogebra = callPackage ../applications/science/math/geogebra { };
 
-  maxima = callPackage ../applications/science/math/maxima { ecl = null; };
-  maxima-ecl = callPackage ../applications/science/math/maxima { sbcl = null; };
+  maxima = callPackage ../applications/science/math/maxima {
+    sbcl = sbcl_1_3_12;
+    ecl = null;
+  };
+  maxima-ecl = callPackage ../applications/science/math/maxima {
+    ecl = ecl_16_1_2;
+    sbcl = null;
+  };
 
   wxmaxima = callPackage ../applications/science/math/wxmaxima { wxGTK = wxGTK30; };