[PATCH v3] Detect if symbol versioning is supported

[Mark Wielaard]

On Fri, Aug 18, 2017 at 03:50:42PM +0200, Ulf Hermann wrote:
> If not, throw an error unless symbol versioning was explicitly
> disabled.

I am not sure supporting systems don't do symbol versioning is a
very good thing to do. But since we do (hohum). It does make sense
to explicitly check for it. Applied.

Thanks,

Mark