RPC IPv6 breaks binary compatibility

[Philip Blundell]

>- We use symbol versioning and add a new version for the RPC functions.
>  In this case we should also fix the broken use of "long", which should
>  be uint32_t. 

This sounds like the right approach.  I guess it will involve a little more 
work inside libc, but this way we avoid having to make the ugly changes to 
client programs that would be needed if we just added a second address field.

p.