Windows daemon mode workaround

src/bitmessagemain.py

@@ -349,12 +349,13 @@ class Main:
         shared.thisapp.lockPid = None # indicate we're the final child
         sys.stdout.flush()
         sys.stderr.flush()
-        si = file(os.devnull, 'r')
-        so = file(os.devnull, 'a+')
-        se = file(os.devnull, 'a+', 0)
-        os.dup2(si.fileno(), sys.stdin.fileno())
-        os.dup2(so.fileno(), sys.stdout.fileno())
-        os.dup2(se.fileno(), sys.stderr.fileno())
+        if not sys.platform.startswith('win'):
+            si = file(os.devnull, 'r')
+            so = file(os.devnull, 'a+')
+            se = file(os.devnull, 'a+', 0)
+            os.dup2(si.fileno(), sys.stdin.fileno())
+            os.dup2(so.fileno(), sys.stdout.fileno())
+            os.dup2(se.fileno(), sys.stderr.fileno())
 
     def setSignalHandler(self):
         signal.signal(signal.SIGINT, helper_generic.signal_handler)