[PATCH] Support for the LOWER_UP flag

[Natanael Copa]

Hi,

Attatched is a patch for the LOWER_UP flag in 'ip link/addr' output. 
Useful to check if network cable is inserted or not.

The code does an ugly ifdef to check if IFF_LOWER_UP is declared or not. 
On my zenwalk desktop it was not. It looks like iproute2 maintain their 
own copies of the linux headers so I suppose we cannot expect the flag 
be there. (should mabe be in one of the include files rather than in the 
.c file?)

The patch does increase the size a bit due to a macro. Maybe should have 
a config option for it?

on my hardened uclibc i386 build:

function                                             old     new   delta
ipaddr_list_or_flush                                2929    2981     +52
.rodata                                             7677    7683      +6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 58/0)               Total: 58 
bytes
   text       data        bss        dec        hex    filename
  47498        670       4244      52412       ccbc    busybox_old
  47556        670       4244      52470       ccf6    busybox_unstripped

-nc
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