...where CPPUNIT_FAIL is marked as noreturn only for __GNUC__

Change-Id: Id820b00d8dfe1218a10cd586d32cc20eb6a003de
Reviewed-on: https://gerrit.libreoffice.org/67244
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>