Work on Windows port by Ruben Van Boxem

llvm-svn: 140384
diff --git a/libcxx/src/string.cpp b/libcxx/src/string.cpp
index 7e651a1..1f58e36 100644
--- a/libcxx/src/string.cpp
+++ b/libcxx/src/string.cpp
@@ -11,6 +11,9 @@
 #include "cstdlib"
 #include "cwchar"
 #include "cerrno"
+#if _WIN32
+#include "support/win32/support.h"
+#endif // _WIN32
 
 _LIBCPP_BEGIN_NAMESPACE_STD