Check if the timeout expired during the time update in qt_safe_select
Check if the timeout expired during the time update in qt_safe_select

It can happen that select(2) returns -1 with EINTR, but the time
remaining was too small for us to update the time. Our own processing
(plus the syscall to clock_gettime(2)) leads us past the timeout, so
we get a negative timeval.

Task-number: QTBUG-6755
Reviewed-by: Bradley T. Hughes

pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt