lib/libc/Versions.def: new symbol version for 12.x

[Ed Schouten]

Hi there,

In a couple of weeks from now I'm going to add new versions of
basename() and dirname() to libc that are thread-safe. These should
now use symbol version "FBSD_1.5", but a question that emaste@ and I
have is: why don't these symbol version names follow the major
versions of FreeBSD? As in, why not call this "FBSD_12.0" instead?

Thoughts?

-- 
Ed Schouten <ed at nuxi.nl>
Nuxi, 's-Hertogenbosch, the Netherlands
KvK-nr.: 62051717