[update] : Read AURHELPER from enviromnment

Author: Hayao0819

modules/base/config.i686

@@ -10,7 +10,11 @@
 #
 
 # この設定ファイルだけで使える変数
-AURHELPER="paru"
+UNSETVAR=false
+if [[ -z "${AURHELPER-""}" ]]; then
+    AURHELPER="paru"
+    UNSETVAR=true
+fi
 
 case "$AURHELPER" in
     "trizen")
@@ -79,4 +83,5 @@ case "$AURHELPER" in
         exit 1
     ;;
 esac
-unset AURHELPER
+
+[[ "$UNSETVAR" = false ]] || unset AURHELPER