tst_lupdate is flaky

********* Start testing of tst_lupdate *********
Config: Using QtTest library 5.6.1, Qt 5.6.1 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2012)
PASS   : tst_lupdate::initTestCase()
QDEBUG : tst_lupdate::good(backslashes) Checking...
PASS   : tst_lupdate::good(backslashes)
QDEBUG : tst_lupdate::good(cmdline_deeppath) Checking...
PASS   : tst_lupdate::good(cmdline_deeppath)
QDEBUG : tst_lupdate::good(cmdline_order) Checking...
PASS   : tst_lupdate::good(cmdline_order)
QDEBUG : tst_lupdate::good(cmdline_recurse) Checking...
PASS   : tst_lupdate::good(cmdline_recurse)
QDEBUG : tst_lupdate::good(codecforsrc) Checking...
FAIL!  : tst_lupdate::good(codecforsrc) 'proc.waitForFinished(30000)' returned FALSE. (c:/Users/qt/work/install/bin/lupdate -silent project.pro)
tst_lupdate.cpp(294) : failure location
QWARN  : tst_lupdate::good(codecforsrc) QProcess: Destroyed while process ("c:\\Users\\qt\\work\\install\\bin\\lupdate") is still running.