Fix pcap-linux.c compilation with non-glibc library

[Kris Katterjohn <katterjohn () gmail com>]

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Kris Katterjohn wrote:
| Hey tcpdump-workers,
|
| I've attached a patch, and submitted it to the SF.net tracker, to check
| for socklen_t in configure.  pcap-linux.c is the only file that uses it,
| but the #ifndef test to check if it's all ready defined or not is broken.
|
| Currently it assumes that glibc is the only library that defines
| socklen_t, so when a different lib that defines it is used, compilation
| fails with a "previous declaration" error.
|

Maybe if I wrote emails when I'm more awake I'd have a more descriptive
title to go along with it :)

Sorry for the extra email, but the other one didn't sound very enticing.

Thanks,
Kris Katterjohn
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