Remove support for old socket implementations

[Alan Bateman]

On 14/02/2014 13:52, Florian Weimer wrote:
> This patch removes support for old, pre-1.4 SocketImpl and 
> DatagramSocketImpl classes.  Compiling these classes has been 
> impossible since 1.4 because 1.4 added new abstract methods to the 
> base classes.
>
> Is this okay in principle?  Could you create bug ID for this?
>
I don't have any objection but I think it requires a bit of discussion 
and some insight into whether anyone might be running with ancient 
SocketImpl (that would have been compiled a long time ago).

-Alan.