Make the guard for external ABI libraries include the guard for
libsupc++ in typeinfo.cpp, bringing it into agreement with
exception.cpp. This fixes link errors due to duplicate symbols from
this translation unit.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@191397 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/typeinfo.cpp b/src/typeinfo.cpp
index 6082894..3bb6fda 100644
--- a/src/typeinfo.cpp
+++ b/src/typeinfo.cpp
@@ -20,7 +20,7 @@
 
 #include "typeinfo"
 
-#if !(defined(_LIBCPPABI_VERSION) || defined(LIBCXXRT))
+#if !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION) && !defined(__GLIBCXX__)
 
 std::bad_cast::bad_cast() _NOEXCEPT
 {
@@ -67,4 +67,4 @@
   }
 #endif
 
-#endif  // _LIBCPPABI_VERSION
+#endif  // !LIBCXXRT && !_LIBCPPABI_VERSION && !__GLIBCXX__