[d8] Fix the shared-library build

src/ostreams.h

Index: src/ostreams.h
diff --git a/src/ostreams.h b/src/ostreams.h
index 977b5c6f4a48cbeda0e0163b678917779afeeac2..dea751413e9158da27fa1c25b21f7d3d4411ff78 100644
--- a/src/ostreams.h
+++ b/src/ostreams.h
@@ -13,6 +13,7 @@
 
 #include "include/v8config.h"
 #include "src/base/macros.h"
+#include "src/globals.h"
 
 namespace v8 {
 namespace internal {
@@ -33,7 +34,7 @@ class OFStreamBase : public std::streambuf {
 
 
 // An output stream writing to a file.
-class OFStream : public std::ostream {
+class V8_EXPORT_PRIVATE OFStream : public std::ostream {
  public:
   explicit OFStream(FILE* f);
   virtual ~OFStream();