socket_wrapper vs heimdal

[Love Hörnquist Åstrand]

Hi

Andrew Bartlet asked if I could add socket_wrapper support for Heimdal
to simply testing on test hosts, and I just tried to do that by  
including
socket_wrapper.h in roken.h/socket_wrapper.c in libroken.
There was some issues.

The is no support for ipv6, and one of my test hosts only returns ::1  
for
localhost which the test assumes, so the tests didn't pass because the
kdc didn't bind to any sockets. The current scheme for bcast doesn't
work for ipv6, since there is only one localhost address.

The non samba build ifdefs doesn't work, it doesnt include the right  
header
files (DLIST), doesn't define _PUBLIC_, etc.

The license of the code is GPL, that wont fly in Heimdal that is BSD  
licensed.
If that doesn't change I'll re-implement enough to get it working
(heimdal doesn't need broadcast, etc).

Love