socket_wrapper vs heimdal

[Love Hörnquist Åstrand]

Tridge,

> btw, I assume this is aimed at the standalone heimdal testing in the
> build farm, not the use within Samba ?

This was for heimdal testing at the first step, but if there is less  
changes
to the heimdal codebase when importing it to the samba tree, its even  
better.

By adding socket_wrapper.h to roken.h, all parts in Heimdal codebase  
will use
socket wrapper.

Love