Fix some places where python2 packages fail to evaluate.

I unfortunately still depend on some python2 packages. It appears
that these two packages fail to evaluate, in a way that `tryEval`
doesn't catch. This changes them to be explicitly disabled there.

pkgs/top-level/python-packages.nix

@@ -545,6 +545,8 @@ in {
 
   appdirs = callPackage ../development/python-modules/appdirs { };
 
+  appleseed = toPythonModule (pkgs.appleseed.override { python3 = self.python; });
+
   applicationinsights = callPackage ../development/python-modules/applicationinsights { };
 
   appnope = callPackage ../development/python-modules/appnope { };

pkgs/top-level/python2-packages.nix

@@ -12,7 +12,7 @@ with self; with super; {
     inherit (pkgs) antlr4;
   };
 
-  appleseed = toPythonModule (pkgs.appleseed.override { inherit (self) python; });
+  appleseed = disabled super.appleseed;
 
   application = callPackage ../development/python-modules/application { };
 
@@ -616,6 +616,8 @@ with self; with super; {
 
   tarman = callPackage ../development/python-modules/tarman { };
 
+  tensorflow-bin = disabled super.tensorflow-bin;
+
   thumbor = callPackage ../development/python-modules/thumbor { };
 
   tmdb3 = callPackage ../development/python-modules/tmdb3 { };