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='2020-08-01 09:00:44 +0200'>2020-08-01</span></td><td><a href='/guix/commit/gnu/packages/digest.scm?id=08447d3a7556fb6355a32c6d5ccb6d4768b8e12d'>gnu: Update xxhash to 0.8.0.</a><span class='msg-avail'>...</span></td><td>Hendursaga</td></tr>
<tr><td><span title='2020-06-29 15:47:11 +0200'>2020-06-29</span></td><td><a href='/guix/commit/gnu/packages/digest.scm?id=1d25cfbaf4b707f5af9aafe6ac3d8828c5b89f45'>gnu: xxhash: Detect vector instructions at run time.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-06-29 15:47:11 +0200'>2020-06-29</span></td><td><a href='/guix/commit/gnu/packages/digest.scm?id=8db9300454d067dfa023430e51d7f394f203d849'>gnu: xxhash: Update to 0.7.4.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-06-29 15:47:11 +0200'>2020-06-29</span></td><td><a href='/guix/commit/gnu/packages/digest.scm?id=9c1324a4164eb7bf3a912b185b2ab9c86447e005'>gnu: xxhash: Cross-compile.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>