AF_LOCAL on Linus *should* be available

[Henrik Nordstrom]

On Wed, 11 May 2005 derrell at samba.org wrote:

> It seems that there is no test for whether <sys/un.h> exists, and thus setting
> HAVE_SYS_UN_H never occurs.

Then add sys/un.h to the list of header files configure should probe for. 
There should be an AC_CHECK_HEADERS instance with a long list of headers..

Regards
Henrik