fix 2001/westley inventory

In `westley.punch.c`m the `westley.punch.c` and `westley.sort.c` files
are constructed and therefore should not be part of the entry's inventory.

2001/westley/Makefile

@@ -234,6 +234,7 @@ clean:
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM westley2*
+	${RM} -f westley.punch.c westley.sort.c
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \