buildsystem: don't allow unpack folder to become visible until tagged

scripts/clean

@@ -22,10 +22,13 @@ clean_package() {
         build_msg "CLR_WARNING" "*" "$(print_color "CLR_WARNING_DIM" "Removing ${i} ...")"
         rm -rf "${i}"
       fi
-    else
+    elif [ -d "${i}" -a -f "${i}/.libreelec-package" ]; then
       # force clean if no stamp found (previous unpack failed)
-      build_msg "" "" "* Removing ${i} ..."
-      rm -rf "${i}"
+      . "${i}/.libreelec-package"
+      if [ "${INFO_PKG_NAME}" = "${1}" ]; then
+        build_msg "" "" "* Removing ${i} ..."
+        rm -rf "${i}"
+      fi
     fi
   done
   rm -f "${STAMPS}/${1}/build_"*