improve make clobber for 1992/adrian

1992/adrian/Makefile

@@ -207,6 +207,7 @@ clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -f adbasename adbasename.c adecho adecho.c adgrep adhead
 	${RM} -f adhead.c adrian adsleep adsleep.c adwc adwc.c
+	${RM} -f ad.alt.temp adwc.alt.c
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \