Windows support by Ruben Van Boxem.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@142235 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/new b/include/new
index 81c16bd..5bcbad0 100644
--- a/include/new
+++ b/include/new
@@ -56,7 +56,9 @@
 #include <exception>
 #include <cstddef>
 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
+#endif
 
 namespace std  // purposefully not using versioning namespace
 {