chore(util) do not remove unarchived downloads

`make cleanup` should be followed by `make` without any need for another
`make setup`. Things like cpanm and the echo module cannot be cleaned on
`make cleanup`, only `make cleanall`.

util/clean.sh

@@ -24,7 +24,6 @@ if [[ -f "$DIR_PATCHED_ROOT/Makefile" ]]; then
 fi
 
 if [[ "$1" == "--all" || "$1" == "--more" ]]; then
-    find $DIR_DOWNLOAD/* -maxdepth 0 -type d | xargs rm -rf
     rm -rf t/servroot* \
         $DIR_SRC_ROOT \
         $DIR_PATCHED_ROOT \