[autotests] tst_qeventloop crashes on Windows + MinGW 4.8

********* Start testing of tst_QEventLoop *********
Config: Using QtTest library 5.1.0, Qt 5.1.0
PASS   : tst_QEventLoop::initTestCase()
PASS   : tst_QEventLoop::processEvents()
QWARN  : tst_QEventLoop::exec() QEventLoop::exec: instance 0x22f62c has already called exec()
PASS   : tst_QEventLoop::exec()

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
terminate called after throwing an instance of 'QEventLoopTestException'