Updates for better partial match support, and to ensure that that the POSIX API functions are able to return the correct error code.

[SVN r9392]

include/boost/re_detail/regex_match.hpp

@@ -879,6 +879,7 @@ bool query_match_aux(iterator first,
       && (first == last))      // end of input has been reached
    {
       have_partial_match = true;
+      temp_match.set_second(first, 0, false);
       m.maybe_assign(temp_match);
    }