add {contrib,non-free}/{metapackages,oldlibs} to section specialhandling

Closes: 788320

debian/apt.conf.autoremove

@@ -29,6 +29,8 @@ APT
   Never-MarkAuto-Sections
   {
 	"metapackages";
+	"contrib/metapackages";
+	"non-free/metapackages";
 	"restricted/metapackages";
 	"universe/metapackages";
 	"multiverse/metapackages";
@@ -37,6 +39,8 @@ APT
   Move-Autobit-Sections
   {
 	"oldlibs";
+	"contrib/oldlibs";
+	"non-free/oldlibs";
 	"restricted/oldlibs";
 	"universe/oldlibs";
 	"multiverse/oldlibs";