Wrap all STL includes to support drv:: and eng::

luprex/core/wrap/wrap-ostream.hpp

@@ -0,0 +1,15 @@
+#ifndef WRAP_OSTREAM_HPP
+#define WRAP_OSTREAM_HPP
+
+#include "two-mallocs.hpp"
+#include <ostream>
+
+namespace eng {
+using ostream = std::ostream;
+} // namespace eng
+
+namespace drv {
+using ostream = std::ostream;
+} // namespace drv
+
+#endif // WRAP_OSTREAM_HPP