Fix -analyse errors from VC8.

Merge a couple of changes from the release branch.


[SVN r31987]

include/boost/regex/v4/regex_traits_defaults.hpp

@@ -142,7 +142,11 @@ struct character_pointer_range
    }
    bool operator == (const character_pointer_range& r)const
    {
-      return ((p2 - p1) == (r.p2 - r.p1)) && std::equal(p1, p2, r.p1);
+      // Not only do we check that the ranges are of equal size before
+      // calling std::equal, but there is no other algorithm available:
+      // not even a non-standard MS one.  So forward to unchecked_equal
+      // in the MS case.
+      return ((p2 - p1) == (r.p2 - r.p1)) && re_detail::equal(p1, p2, r.p1);
    }
 };
 template <class charT>