Added fixes for tests which are unsupported on some platforms.

[SVN r19548]

test/concepts/concept_check.cpp

@@ -28,7 +28,7 @@ int main()
 {
    // VC6 and VC7 can't cope with the iterator architypes, 
    // don't bother testing as it doesn't work:
-#if !BOOST_WORKAROUND(BOOST_MSVC, < 1310)
+#if !BOOST_WORKAROUND(_MSC_VER, < 1310)
    typedef boost::bidirectional_iterator_archetype<char> iterator_type;
    boost::regex r;
    iterator_type a, b;