fn install_crypto_provider()Expand description
Install the process-level rustls crypto provider, before anything can build a TLS client.
The graph carries both aws-lc-rs and ring, so rustls will not choose
and the first handshake panics. install_default returns Err when a
provider is already in place, which is the idempotent success case: a
second boot entry or an embedding caller may run it again.