Revert conversion from lightweight test to Boost.Test.

[SVN r47545]

test/link_ext_test.cpp

@@ -5,13 +5,13 @@
 
 #define HASH_NAMESPACE boost
 #include <boost/functional/hash.hpp>
-#include <boost/test/minimal.hpp>
+#include <boost/detail/lightweight_test.hpp>
 #include <vector>
 
 int f(std::size_t hash1, int* x1) {
     // Check that HASH_NAMESPACE::hash<int*> works in both files.
     HASH_NAMESPACE::hash<int*> ptr_hasher;
-    BOOST_CHECK(hash1 == ptr_hasher(x1));
+    BOOST_TEST(hash1 == ptr_hasher(x1));
 
     // Check that std::vector<std::size_t> is avaiable in this file.
     std::vector<std::size_t> x;