Add Camellia ECDHE in GCM ciphers

[wolfbeast]

Please consider adding Camellia in GCM with ECDHE/RSA and ECDHE/ECDSA.
This would add a secure and practically fast cipher to the available suites.

If you need hints, you can look at my client-side implementation in my (forked) NSS for Pale Moon:
https://github.com/MoonchildProductions/Pale-Moon/blob/master/security/patches/Add-Camellia-GCM-patch.diff