tools,gyp: don't force build actions with multiple outputs

Don't add `force_append` (FORCE_DO_CMD) to the intermediate sentinal.
Adding it makes the action run alway, even when there are no changes.
(refack): AFAICT because `*.intermediate` files don't have build rules.

PR-URL: https://github.com/nodejs/node/pull/23156


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>