Bug 7755: audiotest.au is arguably copyrighted material, but definitely makes

Debian unhappy.  The actual contents of the audio clip are unimportant, so
replace it with something that we know is okay.  Guido likes woodpeckers.

Author: warsaw

Lib/email/test/data/audiotest.au

@@ -76,7 +76,7 @@ def play_sound_file(self, data, rate, ssize, nchannels):
 
         # set parameters based on .au file headers
         dsp.setparameters(AFMT_S16_NE, nchannels, rate)
-        self.assertTrue(abs(expected_time - 2.94) < 1e-2, expected_time)
+        self.assertTrue(abs(expected_time - 3.51) < 1e-2, expected_time)
         t1 = time.time()
         dsp.write(data)
         dsp.close()

Lib/test/audiotest.au

@@ -348,6 +348,8 @@ C-API
 Library
 -------
 
+- Issue #7755: Use an unencumbered audio file for tests.
+
 - Issue #8621: uuid.uuid4() returned the same sequence of values in the
   parent and any children created using ``os.fork`` on MacOS X 10.6.