fix crash with WIN64 in testrunner
fix crash with WIN64 in testrunner

Reported by: Peter Tax

freedesktop-unofficial-mirror/libreoffice__cppunit,ryancalhoun/cppunit,freedesktop-unofficial-mirror/libreoffice__cppunit,freedesktop-unofficial-mirror/libreoffice__cppunit,ryancalhoun/cppunit,freedesktop-unofficial-mirror/libreoffice__cppunit,LesleyLai/cppunit,LesleyLai/cppunit,LesleyLai/cppunit,project-zerus/cppunit,ryancalhoun/cppunit,project-zerus/cppunit,project-zerus/cppunit,LesleyLai/cppunit,ryancalhoun/cppunit