Fix make clobber in 2013/endoh3

Have to remove *.wav files. This is important for updating the manifest
if the program was run and generated wav files (because the other tools
were not found).

2013/endoh3/Makefile

@@ -204,7 +204,7 @@ clean:
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
-	${RM} -rf *.dSYM
+	${RM} -rf *.dSYM *.wav
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \