Increase thread timeout to reduce flakiness.

Taken from upstream:
https://github.com/xbmc/xbmc/commit/574b0182d8b641fd24029f372ebdcccc897123e2

diff --git a/xbmc/threads/test/TestEvent.cpp b/xbmc/threads/test/TestEvent.cpp
index 42fb8c2fc609..40e644c0ed3c 100644
--- a/xbmc/threads/test/TestEvent.cpp
+++ b/xbmc/threads/test/TestEvent.cpp
@@ -484,7 +484,7 @@ TEST(TestEvent, GroupTimedWait)
   EXPECT_TRUE(w3.result == NULL);
 
   // this should end given the wait is for only 50 millis
-  EXPECT_TRUE(waitThread3.timed_join(MILLIS(100)));
+  EXPECT_TRUE(waitThread3.timed_join(MILLIS(200)));
 
   EXPECT_TRUE(!w3.waiting);
   EXPECT_TRUE(w3.result == NULL);
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<div class='path'>path: <a href='/guix/log/?id=f65d5e84dead34de889482bc394d2734de7517f7'>root</a>/<a href='/guix/log/CODE-OF-CONDUCT?id=f65d5e84dead34de889482bc394d2734de7517f7'>CODE-OF-CONDUCT</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/CODE-OF-CONDUCT?id=f65d5e84dead34de889482bc394d2734de7517f7&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-05-29 18:29:36 +0200'>2018-05-29</span></td><td><a href='/guix/commit/CODE-OF-CONDUCT?id=a076f19908d06b6df49f1c25c40de8838213cd71'>CODE-OF-CONDUCT: Switch to version 1.4 of the Contributor Covenant.</a><span class='msg-avail'>...<span class='msg-tooltip'>See the discussion at
&lt;https://lists.gnu.org/archive/html/guix-devel/2018-05/msg00146.html&gt;.

* CODE-OF-CONDUCT: Adapt from version 1.4 of the Contributor Covenant.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-04-04 23:45:57 +0200'>2016-04-04</span></td><td><a href='/guix/commit/CODE-OF-CONDUCT?id=e314ce1bd7b21229c750ab7132feac8189da87ba'>CoC: Clarify which project we're talking about.</a><span class='msg-avail'>...<span class='msg-tooltip'>* CODE-OF-CONDUCT: Define "project" and "project maintainer" as
suggested by rms.
</span></span></td><td>Ludovic Courtès</td></tr>