Add helper to return &mut SslRef from stream

[jmayclin]

Currently there is no way to retrieve a mutable reference to the underlying SslRef given some SslStream. This PR adds an ssl_mut method to do that.

[jmayclin]

There is a failure in the CI, but it looks to be unrelated to my PR.

error: package `cc v1.0.95` cannot be built because it requires rustc 1.63 or newer, 
while the currently active rustc version is 1.56.0

cc bumped their MSRV in the latest release (3 days ago): https://github.com/rust-lang/cc-rs/releases/tag/1.0.95, which appears to be the reason for this failure.

[botovq]

CI should be fixed once you rebase on main

[jmayclin]

Hi @alex, wondering if you could take a look at this? Thanks!

[alex]

Unfortunately I don't use the ssl layer of this package, only the libcrypto parts, so I'm not familiar with this part of the code or the semantics to know if this raises any potential issues.

[jmayclin]

Ah, I understand. Do you know how I could go about getting this reviewed?

[alex]

Hopefully Steven will review as he has time.

…

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-- All that is necessary for evil to succeed is for good people to do nothing.

[jmayclin]

Hi @sfackler, I am still interested in getting this merged in. Please let me know if you have any feedback or concerns!