build, win: opt-in openssl_no_asm if no nasm found

Instead of automatically falling back to openssl_no_asm with warning
if no nasm is found during build on Windows, this stops vcbuild.bat
and requires users to specify openssl_no_asm option explicitly.

Fixes: https://github.com/nodejs/node/issues/19918
PR-URL: https://github.com/nodejs/node/pull/19943
Refs: https://github.com/nodejs/node/pull/19930


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>