AF_LOCAL on Linus *should* be available

[derrell at samba.org]

Running "configure.developer" in the SAMBA_3_0 tree, I noticed that it
displays:

  checking for AF_LOCAL socket support... no

All four of AF_LOCAL, AF_UNIX, PF_LOCAL, PF_UNIX are defined in
<linux/socket.h>.  Since I'm not a follower of the black art of "configure"
scripting, maybe someone who is can look and see why it thinks that AF_LOCAL
is not available.

Cheers,

Derrell