Removal of a pre-existing library interface

[Xin Li]

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Hi,

Recently, OpenBSD have moved from RC4 to ChaCha20 for their
arc4random(3) family of functions and they have later removed a few
interfaces for good reasons.

On FreeBSD, we aim to maintain ABI stability so we can not simply
remove the interface; we can not remove it from -HEAD because they are
established by previous -STABLE branches, or we would have to bump
major number of shared libraries.  After thinking about some other
alternatives, I have created two dummy (well, they also log the event)
compatibility shims for these two interfaces that gets removed from
OpenBSD.

Is this a reasonable approach of handling changes like this?

Cheers,
- -- 
Xin LI <delphij at delphij.net>    https://www.delphij.net/
FreeBSD - The Power to Serve!           Live free or die
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=dXxi
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