bpo-30595: Increase test_queue_feeder_donot_stop_onexc() timeout (GH-2148) (GH-5429)

_test_multiprocessing.test_queue_feeder_donot_stop_onexc() now uses a
timeout of 1 second on Queue.get(), instead of 0.1 second, for slow
buildbots.

(cherry picked from commit 8f6eeaf21cdf4aea25fdefeec814a1ce07453fe9)
diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py
index a77bfee..1071d7f 100644
--- a/Lib/test/test_multiprocessing.py
+++ b/Lib/test/test_multiprocessing.py
@@ -671,7 +671,8 @@
             q = self.Queue()
             q.put(NotSerializable())
             q.put(True)
-            self.assertTrue(q.get(timeout=0.1))
+            # bpo-30595: use a timeout of 1 second for slow buildbots
+            self.assertTrue(q.get(timeout=1.0))
 
 
 #