build: silence OpenSSL Windows compiler warnings

Silence the following compiler warning on Windows:
`'function': different 'const' qualifiers`

PR-URL: https://github.com/nodejs/node/pull/31311


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>