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/climits b/include/climits
index c82becd..81ffecd 100644
--- a/include/climits
+++ b/include/climits
@@ -41,6 +41,8 @@
 #include <__config>
 #include <limits.h>
 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
+#endif
 
 #endif  // _LIBCPP_CLIMITS