build,win: remove unmatched `endlocal` statement

Seems like it's a leftover from c403eeb7

PR-URL: https://github.com/nodejs/node/pull/22627


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>