Makefile: clean should just remove ${OUTPUT_DIRS}

skel/make.sh

@@ -257,12 +257,7 @@ do
     case ${func} in
     clean)
         echo "Cleaning..."
-        for dir in ${OUTPUT_DIRS}
-        do
-            [ -e "${dir}" ] && do_cmd \
-                find "${dir}" \( -type f -o -type l \) -exec rm {} \;
-            [ $? -ne 0 ] && exit $?
-        done
+        rm -rf ${OUTPUT_DIRS}
         print_success "Done"
     ;;