googlemock: Disable WhenDynamicCastToTest tests when RTTI is off

https://github.com/google/googletest/issues/610
diff --git a/googlemock/test/gmock-matchers_test.cc b/googlemock/test/gmock-matchers_test.cc
index b09acba..72e3412 100644
--- a/googlemock/test/gmock-matchers_test.cc
+++ b/googlemock/test/gmock-matchers_test.cc
@@ -3179,6 +3179,8 @@
   return ExplainMatchResult(inner_matcher, arg.i, result_listener);
 }
 
+#if GTEST_HAS_RTTI
+
 TEST(WhenDynamicCastToTest, SameType) {
   Derived derived;
   derived.i = 4;
@@ -3236,12 +3238,8 @@
 
 TEST(WhenDynamicCastToTest, Describe) {
   Matcher<Base*> matcher = WhenDynamicCastTo<Derived*>(Pointee(_));
-#if GTEST_HAS_RTTI
   const string prefix =
       "when dynamic_cast to " + internal::GetTypeName<Derived*>() + ", ";
-#else  // GTEST_HAS_RTTI
-  const string prefix = "when dynamic_cast, ";
-#endif  // GTEST_HAS_RTTI
   EXPECT_EQ(prefix + "points to a value that is anything", Describe(matcher));
   EXPECT_EQ(prefix + "does not point to a value that is anything",
             DescribeNegation(matcher));
@@ -3275,6 +3273,8 @@
   EXPECT_THAT(as_base_ref, Not(WhenDynamicCastTo<const OtherDerived&>(_)));
 }
 
+#endif  // GTEST_HAS_RTTI
+
 // Minimal const-propagating pointer.
 template <typename T>
 class ConstPropagatingPtr {