Always include debugger support.

src/d8-debug.cc

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-#ifdef ENABLE_DEBUGGER_SUPPORT
-
 #include "d8.h"
 #include "d8-debug.h"
 #include "debug-agent.h"
 #include "platform/socket.h"
 
 
 namespace v8 {
 
 static bool was_running = true;
 
@@ skipping 323 matching lines @@
     }
 
     // Pass the keyboard command to the main thread.
     remote_debugger_->KeyboardCommand(
         i::SmartArrayPointer<char>(i::StrDup(command)));
   }
 }
 
 
 }  // namespace v8
-
-#endif  // ENABLE_DEBUGGER_SUPPORT