ITS#9790 Fix build with old GCC
Versions 4.1 and 4.3 show the following error:
In file included from ../../include/lutil.h:21,
from passwd.c:60:
../../include/ac/socket.h:247: error: redefinition of typedef 'Sockaddr'
../../include/ldap_pvt.h:188: error: previous declaration of 'Sockaddr' was here