Update trex.py to work with Windows10 on simulation

py/drivers/trex.py

@@ -7,7 +7,7 @@
 
 import struct
 from collections import OrderedDict
-import fcntl
+#import fcntl  # non existing on Windows10
 import time
 
 # from stackoverflow, it's safer to proxy dict rather than subclassing it
@@ -113,6 +113,7 @@ class TrexIO():
             pass
         else:
             import crcmod
+            import fcntl
             self.__i2c_fd ={
                     "in": open("/dev/i2c-"+str(bus_nb), 'rb', buffering=0),
                     "out": open("/dev/i2c-"+str(bus_nb), 'wb', buffering=0)