Fix libiproute build with kernel headers older than 2.6.17

[Stefan Seyfried]

Hi,

the attached patch fixes the build if your kernel headers happen to be
older than 2.6.17, which is when IFLA_OPERSTATE was introduced.

Unfortunately, IFLA_OPERSTATE is not a define, so I can't check it with
#ifdef. However, IFF_DORMANT is a define and was introduced with the very
same commit, so we might be safe.

A comment explaining this situation is in place.

Have fun,

	Stefan
-- 
Stefan Seyfried

"Dispatch war rocket Ajax to bring back his body!"
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