build: silence false errors during make clean
build: silence false errors during make clean

(cherry picked from commit 1e72d5c03335e472cf5b9207419d6125fed9aec4)

reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin