doc: add note in BUILDING.md about running `make distclean`

Fixes: https://github.com/nodejs/node/issues/28675

PR-URL: https://github.com/nodejs/node/pull/31542


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>