fix 1988/applin clobber and .gitignore

1988/applin/.gitignore

@@ -1,4 +1,5 @@
 applin
 large.c
 zsmall
+zsmall.c
 applin.alt

1988/applin/Makefile

@@ -183,7 +183,7 @@ clean:
 	fi
 
 clobber: clean
-	${RM} -f ${TARGET} ${ALT_TARGET}
+	${RM} -f ${TARGET} ${ALT_TARGET} zsmall.c
 	${RM} -f large.c
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \