For "pcap_findalldevs()", don't assume that just because it's in -lpcap

it's usable - one of the updates to OS X 10.3 updated libpcap to
0.8[.x], so that it had "pcap_findalldevs()", but didn't update
"pcap.h", so it didn't declare "pcap_if_t", so you couldn't actually
*use* it.  You can work around that by installing the pcap.h (and
pcap-bpf.h) from the matching tcpdump.org release, but, as even when
that version of OS X is pre-installed rather than being the result of a
Software Update, you still don't get the new "pcap.h" (at least I didn't
get it on my PowerBook with 10.3.4).  Therefore, we check whether a
program that calls "pcap_findalldevs()" *and* declares a "pcap_if_t *"
to pass to it can be compiled and linked with -lpcap, and only declare
HAVE_PCAP_FINDALLDEVS if we can.

Also, don't check for the functions added to libpcap after
"pcap_findalldevs()" was added unless we have a usable
"pcap_findalldevs()", as, if not, those functions won't be declared in
"pcap.h" either, so we'll get compiler warnings.

svn path=/trunk/; revision=11745

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