doc: remove obsolete wiki references from BUILDING

Remove obsolete wiki references from BUILDING.md.

PR-URL: https://github.com/nodejs/node/pull/21369


Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>