Fix 2020/kurdyukov2 make clobber, .gitignore, try

2020/kurdyukov2/Makefile

@@ -212,7 +212,7 @@ clean:
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
-	${RM} -rf *.dSYM
+	${RM} -rf *.dSYM *.gif *.ppm out*.jpg
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \