[Gardening] Remove dead code from ScriptInterpreterPython (NFC)

The terminal state is never saved or restored.

llvm-svn: 367977

lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPythonImpl.h

@@ -347,10 +347,6 @@ public:
 
   void LeaveSession();
 
-  void SaveTerminalState(int fd);
-
-  void RestoreTerminalState();
-
   uint32_t IsExecutingPython() const { return m_lock_count > 0; }
 
   uint32_t IncrementLockCount() { return ++m_lock_count; }
@@ -387,7 +383,6 @@ public:
   PythonObject m_run_one_line_function;
   PythonObject m_run_one_line_str_global;
   std::string m_dictionary_name;
-  TerminalState m_terminal_state;
   ActiveIOHandler m_active_io_handler;
   bool m_session_is_active;
   bool m_pty_slave_is_open;