cppunit.m4: patch #946302, AM_PATH_CPPUNIT doesn't report result if CppUnit is missing.
cppunit.m4: patch #946302, AM_PATH_CPPUNIT doesn't report result
if CppUnit is missing.

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