* net.cc (in6addr_any, in6addr_loopback): Add appropriate number of braces

* net.cc (in6addr_any, in6addr_loopback): Add appropriate number of braces
around initializer.
(dup_ent): Try harder to coerce the first argument to deal with more stringent
compiler.
(get_2k_ifs): Remove extraneous typedef.
(get_2k_ifs): Reorganize expression to avoid a compiler warning.
(get_xp_ifs): Ditto.
(get_nt_ifs): Ditto.