Increase the timeout on 'cpu-mix-test' to accommodate slower machines.

--- pulseaudio-6.0/src/tests/cpu-mix-test.c.ORIG	2015-02-12 09:10:35.000000000 -0500
+++ pulseaudio-6.0/src/tests/cpu-mix-test.c	2015-03-31 13:45:05.316878322 -0400
@@ -212,7 +212,7 @@
 #if defined (__arm__) && defined (__linux__) && defined (HAVE_NEON)
     tcase_add_test(tc, mix_neon_test);
 #endif
-    tcase_set_timeout(tc, 120);
+    tcase_set_timeout(tc, 240);
     suite_add_tcase(s, tc);
 
     sr = srunner_create(s);
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<tr><td><span title='2017-05-10 22:05:21 +0200'>2017-05-10</span></td><td><a href='/guix/commit/tests/ui.scm?id=30d2397f73d6fa9e77eed70ec6df8afd3b9f5f5e'>ui: 'string-&gt;duration' correctly handles hours.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-03-08 23:42:53 +0100'>2017-03-08</span></td><td><a href='/guix/commit/tests/ui.scm?id=1062063a65036f32a061c54866d33ffe079ec44e'>ui: Don't use '%default-port-encoding' to set the encoding of string ports.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-06-09 23:34:56 +0200'>2016-06-09</span></td><td><a href='/guix/commit/tests/ui.scm?id=638c5b79397aba92ab3211a1ea3b3418e112ec66'>ui: 'string-&gt;duration' supports hours and seconds.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-04-03 14:19:09 +0200'>2016-04-03</span></td><td><a href='/guix/commit/tests/ui.scm?id=a9edb211e733b8b34e67ec3b4450567e9376986f'>build: Add a Guile custom test driver using SRFI-64.</a><span class='msg-avail'>...</span></td><td>Mathieu Lirzin</td></tr>