Change a couple ifdefs from '#if __cplusplus >= 2011xxx' to '#ifndef _LIBCPP_CXX03_LANG'. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@275787 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/iterator b/include/iterator
index 2e30a92..abd142e 100644
--- a/include/iterator
+++ b/include/iterator
@@ -700,7 +700,7 @@
     return __x.base() >= __y.base();
 }
 
-#if __cplusplus >= 201103L
+#ifndef _LIBCPP_CXX03_LANG
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY
 auto
@@ -1117,7 +1117,7 @@
     return __x.base() <= __y.base();
 }
 
-#if __cplusplus >= 201103L
+#ifndef _LIBCPP_CXX03_LANG
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY
 auto
@@ -1186,7 +1186,7 @@
 bool
 operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
-#if __cplusplus >= 201103L
+#ifndef _LIBCPP_CXX03_LANG
 template <class _Iter1, class _Iter2>
 _LIBCPP_INLINE_VISIBILITY
 auto
@@ -1379,7 +1379,7 @@
     bool
     operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
-#if __cplusplus >= 201103L
+#ifndef _LIBCPP_CXX03_LANG
     template <class _Iter1, class _Iter2>
     friend
     auto
@@ -1496,7 +1496,7 @@
     return !(__y < __x);
 }
 
-#if __cplusplus >= 201103L
+#ifndef _LIBCPP_CXX03_LANG
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY
 auto