Use order instead of size to find the next order in the non-typeof implementation of mpl::insert for mpl::map. Fixes #2042.

[SVN r55727]

libs/mpl

@@ -1 +1 @@
-Subproject commit c1de64359f2a46c4dd0e66bbbfb74f615c8db04e
+Subproject commit d38f271fae14063cfa6a8b7e69a0e870a01a61ce