Replace _LIBCPP_HAS_NO_DELETED_FUNCTIONS with _LIBCPP_CXX03_LANG

llvm-svn: 291278
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 8f56dedb5f6aaf7ccfe58885de6797ab55a573a6
diff --git a/include/istream b/include/istream
index e935f51..774f38d 100644
--- a/include/istream
+++ b/include/istream
@@ -205,14 +205,9 @@
       basic_ios<char_type, traits_type>::swap(__rhs);
     }
 
-#if _LIBCPP_STD_VER > 11
-#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
+#ifndef _LIBCPP_CXX03_LANG
     basic_istream           (const basic_istream& __rhs) = delete;
     basic_istream& operator=(const basic_istream& __rhs) = delete;
-#else
-    basic_istream           (const basic_istream& __rhs); // not defined
-    basic_istream& operator=(const basic_istream& __rhs); // not defined
-#endif
 #endif
 public: