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=7297ebb28759b57db684be8cb4423e3221571401'>root</a>/<a href='/guix/log/tests?id=7297ebb28759b57db684be8cb4423e3221571401'>tests</a>/<a href='/guix/log/tests/texlive.scm?id=7297ebb28759b57db684be8cb4423e3221571401'>texlive.scm</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/tests/texlive.scm?id=7297ebb28759b57db684be8cb4423e3221571401&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-06-15 17:03:19 +0200'>2017-06-15</span></td><td><a href='/guix/commit/tests/texlive.scm?id=afbc94194e223378dd3aece6e2330015e5e57a1e'>guix: Add texlive importer.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/texlive.scm: New file.
* guix/scripts/import/texlive.scm: New file.
* Makefile.am (MODULES): Add them.
* tests/texlive.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
* guix/scripts/import.scm (importers): Add texlive importer.
* doc/guix.texi (Invoking guix import): Document it.
</span></span></td><td>Ricardo Wurmus</td></tr>