cfg: Avoid deprecated option despite it being the only way to have warnings reported as errors.

Makefile

@@ -69,7 +69,7 @@ style:
 	-astyle --mode=c --options=none --recursive -q -Q -s4 -f -j -k1 -W3 -p -U -H ${SRCDIR}/*.hpp
 
 lintian:
-	lintian --pedantic --profile debian --fail-on-warnings --verbose --display-experimental
+	lintian --pedantic --profile debian --verbose --display-experimental
 
 install:
 	${INSTALL} -D -o root -g root -m 700 -t ${DESTDIR}${prefix}/bin ${TARGETS}