message: Fix mac build breakage due to StringStream move
diff: #include "lldb/Core/Module.h"
  #include "lldb/Core/ModuleSpec.h"
  #include "lldb/Core/StreamFile.h"
  -#include "lldb/Core/StreamString.h"
  +#include "lldb/Utility/StreamString.h"
  #include "lldb/Core/StructuredData.h"
  #include "lldb/Host/ConnectionFileDescriptor.h"
  #include "lldb/Host/Endian.h"
  