- added implementation of stdc++ for haiku

- this differs slightly from the one that lives in buildtools/gcc as it
  has been "ported" to the newer libio that haiku uses as part of its own
  libroot


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9906 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/cpp/iosfwd

@@ -0,0 +1,15 @@
+// -*- C++ -*- I/O forward declaration header.
+// This file is part of the GNU ANSI C++ Library.
+
+#ifndef __IOSFWD__
+#define __IOSFWD__
+class ios;
+class streambuf;
+class istream;
+class ostream;
+class iostream;
+class filebuf;
+class ifstream;
+class ofstream;
+class fstream;
+#endif