QtVersion: Set qmakeIsExecutable to false if qmake crashes.
This prevents literally dozens of crash dialog boxes on Windows. Check for a crash in the helper library and in updateVersionInfo consistently whatever is called first. Initialize qmakeIsExecutable in 2nd constructor as well. Change-Id: Ifafb7b3edfae8826ac062d634a39a2a804446942 Reviewed-on: http://codereview.qt.nokia.com/1661Reviewed-by: Qt Sanity Bot <email@example.com> Reviewed-by: Daniel Teske <firstname.lastname@example.org>
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