Enough is enough. Requiring anybody who uses Ethereal on Linux to

update their libpcap probably isn't going to scale - the increasing
frequency with which "Ethereal hangs when I try to capture packets"
shows up on "ethereal-dev" suggests that, unless and until a libpcap
with the "select()" in it becomes ubiquitous on Linux, that'll be the
source of a constant support burden - so we'll just put the "select()"
in Ethereal if it's being built for Linux.

(Putting it in for platforms where the read timeout argument to
"pcap_open_live()" works adds an extra useless system call at best and,
at worst, could make Ethereal not work - "select()" doesn't work on
"/dev/bpf" devices on FreeBSD 3.3, at least, unless you're in "immediate
mode", and, whilst "immediate mode" would make Ethereal respond more
quickly when packets arrive, it might cause Ethereal to respond too
quickly, doing reads for every new packet rather than waiting for
multiple packets to arrive and reading them all with one "read()", which
appears to be at least part of the intent of the read timeout on
"/dev/bpf" devices in BSD.)

svn path=/trunk/; revision=1451

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