Fix make clobber in 2014/endoh2

Since the try script creates the files hello.c, hello, ioccc.c and ioccc
the clobber rule needs to remove those files.

The script now uses less(1) for longer output (it's possible there are
still small enough displays where it would be useful).

2014/endoh2/Makefile

@@ -201,7 +201,7 @@ clean:
 	fi
 
 clobber: clean
-	${RM} -f ${TARGET} ${ALT_TARGET}
+	${RM} -f ${TARGET} ${ALT_TARGET} ioccc ioccc.c hello hello.c
 	${RM} -rf *.dSYM
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \