Unordered: Reduce the amount of meta-stuff in the tests.

Some of this was there for older compilers, some is just premature
generalization. There's still too much metaprogramming, but these are things
that are relatively easy to remove.

[SVN r79356]

test/helpers/strong.hpp

@@ -8,7 +8,6 @@
 
 #include <boost/config.hpp>
 #include <iterator>
-#include "./metafunctions.hpp"
 #include "./equivalent.hpp"
 #include "./list.hpp"
 #include "./exception_test.hpp"