doctor: exempt android-ndk from check_openssl_links

Addresses #33414 for now.
Sorry, my fault; I shouldn't have taken that comment as license. I re-opened the issue ticket as a nag to fix this better. I had imagined that git blame would suffice but it wasn't a great commit message and if nothing else a comment is more durable.

The NDK source repository is available and it is probably possible to build it from source but it looks like a project.