Add a couple of missing includes for hash_range_test and hash_string_test

[SVN r32785]

test/hash_range_test.cpp

@@ -20,6 +20,7 @@
 #include <boost/limits.hpp>
 #include <boost/mpl/assert.hpp>
 #include <boost/type_traits/is_base_and_derived.hpp>
+#include <vector>
 
 void hash_range_tests()
 {

test/hash_string_test.cpp

@@ -16,6 +16,7 @@
 #include <boost/limits.hpp>
 #include <boost/mpl/assert.hpp>
 #include <boost/type_traits/is_base_and_derived.hpp>
+#include <string>
 
 #include "./compile_time.hpp"