Fix a failing test on an apparently slow Windows buildbot.

On slower Windows machines, waiting 0.1 seconds can sometimes not be
enough for a subprocess to start and be ready to accept signals, causing
the test to fail. One buildbot is also choking on input()/EOFError so
that was changed to not depend on input.

Lib/test/win_console_handler.py

@@ -39,4 +39,5 @@ if __name__ == "__main__":
         exit(-1)
 
     # Do nothing but wait for the signal
-    input()
+    while True:
+        pass