buildrepo: add message that we are puring old packages

buildrepo.in

@@ -79,6 +79,7 @@ build() {
 
 	# kill old packages in repo
 	if [ -n "$dopurge" ]; then
+		echo ">>> Removing old packages from $repo..."
 		local tmp=$(mktemp /tmp/$program-XXXXXX)
 		local purgefiles
 		cd "$repodir/$repo/$arch" || return 1