Issue #14753: Make multiprocessing treat negative timeouts as it did in 3.2

In Python 3.2 and earlier, Process.join() and Connection.poll()
treated negative timeouts as zero timeouts.  Earlier versions from
the 3.3 line of development treat them as infinite timeouts.

The patch reverts to the old behaviour.

Lib/multiprocessing/util.py

@@ -295,18 +295,3 @@ class ForkAwareLocal(threading.local):
         register_after_fork(self, lambda obj : obj.__dict__.clear())
     def __reduce__(self):
         return type(self), ()
-
-
-#
-# Automatic retry after EINTR
-#
-
-def _eintr_retry(func):
-    @functools.wraps(func)
-    def wrapped(*args, **kwargs):
-        while True:
-            try:
-                return func(*args, **kwargs)
-            except InterruptedError:
-                continue
-    return wrapped