fix tst_QMenu::task242454_sizeHint for Windows mobile
fix tst_QMenu::task242454_sizeHint for Windows mobile

QMenu actually doesn't use QFontMetrics::width to calculate its bounding
rect but QFontMetrics::boundingRect. That's why this test failed on
Windows CE.

Reviewed-by: thierry

RLovelett/qt,igor-sfdc/qt-wk,KDE/qt,radekp/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,radekp/qt,KDE/qt,pruiz/wkhtmltopdf-qt,radekp/qt,KDE/qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,KDE/qt,pruiz/wkhtmltopdf-qt,KDE/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,radekp/qt,radekp/qt,radekp/qt,RLovelett/qt,KDE/qt,RLovelett/qt,igor-sfdc/qt-wk,RLovelett/qt,pruiz/wkhtmltopdf-qt,radekp/qt,RLovelett/qt,igor-sfdc/qt-wk,KDE/qt,radekp/qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,RLovelett/qt,igor-sfdc/qt-wk,KDE/qt,radekp/qt,RLovelett/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,radekp/qt,pruiz/wkhtmltopdf-qt