Fix make clobber in 2004/sds

2004/sds/Makefile

@@ -203,7 +203,7 @@ clean:
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
-	${RM} -rf *.dSYM
+	${RM} -rf *.dSYM encoder* message remarks.md sds2_msg.c sds_msg*
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \