Fix make clobber in 2013/misake

2013/misaka/Makefile

@@ -283,6 +283,7 @@ clobber: clean
 	${RM} -rf *.dSYM
 	${RM} -f misaka2.c misaka3.c misaka4.c misaka5.c
 	${RM} -f misaka6.c misaka7.c misaka8.c misaka9.c
+	${RM} -f same_as_long_cat.txt long_cat.txt
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \