win, build: fix building on 32-bit machines

Fixes: https://github.com/nodejs/node/issues/21402

PR-URL: https://github.com/nodejs/node/pull/21437
Fixes: https://github.com/nodejs/node/issues/21402


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>