tst_QEventLoop::testQuitLock() is flaky on macOS 10.12

agent:2017/05/23 13:04:47 build.go:270: [make check -j1] 900 1200
/Users/qt/work/qt/qtbase/tests/auto/corelib/kernel/qeventloop/target_wrapper.sh  ./tst_qeventloop testQuitLock
********* Start testing of tst_QEventLoop *********
Config: Using QtTest library 5.9.1, Qt 5.9.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 8.0.0 (clang-800.0.42.1) (Apple))
PASS   : tst_QEventLoop::initTestCase()
QDEBUG : tst_QEventLoop::testQuitLock() 16
FAIL!  : tst_QEventLoop::testQuitLock() 'timerSpy.count() > 17' returned FALSE. ()
   Loc: [tst_qeventloop.cpp(678)]
PASS   : tst_QEventLoop::cleanupTestCase()
Totals: 2 passed, 1 failed, 0 skipped, 0 blacklisted, 3203ms
********* Finished testing of tst_QEventLoop *********
make: *** [check] Error 1