• `mongo_crypto_*` depends on the operating system, and on linux on whether ssl is enabled
• `ssl_provider_` usually coincides with `mongo_crypto_`, but if SSL is disabled it'll get set to `none`.

In SCons this "overriding" logic might have been intuitive, but in Bazel it's very easy to accidentally mix them up.

We should figure out a solution that is less prone to user-error.

It's likely preferable to address this issue after all occurrences of `ssl_provider` and `MONGO_CRYPTO` have been removed from SCons.