Fix time_ns on python3.6

Author: wtdcode

qiling/os/qnx/syscall.py

@@ -3,7 +3,15 @@
 # Cross Platform and Multi Architecture Advanced Binary Emulation Framework
 #
 
-from time import time_ns
+try:
+    from time import time_ns
+except ImportError:
+    from datetime import datetime
+    # For compatibility with Python 3.6
+    def time_ns():
+        now = datetime.now()
+        return int(now.timestamp() * 1e9)
+
 from binascii import hexlify
 
 from qiling.utils import ql_get_module_function