interface slip: cast keepalive/outfill to unsigned long to fix warnings on 64bit hosts -- no functional changes since these only have an 8bit range anyways

The rewrite of if_readlist() on 28 Jun 2003 broke the function when the
proc interface isn't readable.  Have if_readlist() return an error only if
both if_readxxx funcs failed.  This fixes Gentoo 238363.

enable -fno-strict-aliasing until the code base gets a hefty clean up to fix all of the strict aliasing problems

The local include trees no longer need -idirafter semantics, so use the
normal -I flags to avoid random cruft on users' systems.  This fixes Gentoo
#283759 where user had local headers named the same as the net-tools local
headers, but the toolchain defaulted to the system paths due to -idirafter.

touch up build system to respect normal toolchain env vars rather than requiring people to set random custom ones

The recent patch to add udplite support introduced a typo in the udp name.
This fixes Gentoo #282794 and Debian #545328.  Originally reported by
Ambroz Bizjak <ambro@b4ever.net>.

Patch from Petr Pisar [Berlios Bug#16232].

[ Feature Request #4466 ] --continuous should flush stdout

fast. Problem reported by Ragnar Hojland Espinosa <ragnar@ragnar-hojland.com>

Fabian Hugelshofer <hugelshofer2006@gmx.ch>

(Debian Bug #222209 Pierre Lombard, Tollef Fog Heen)

Move man pages to sysadmin books
update samples for route(8) (Debian Bug#400844, #368697 Danny Rathjens)
update see also for ifconfig(8) (Debian Bug#365916 Dan Jacobs)

listening sockets.

backlog)