lldb_batchmode.py: try import _thread for Python 3

Author: cuviper

src/etc/lldb_batchmode.py

@@ -18,10 +18,15 @@
 import os
 import sys
 import threading
-import thread
 import re
 import time
 
+try:
+    import thread
+except ModuleNotFoundError:
+    # The `thread` module was renamed to `_thread` in Python 3.
+    import _thread as thread
+
 # Set this to True for additional output
 DEBUG_OUTPUT = False