Don't use PCAP_ERROR if it's not known to be defined.

The introduction of pcap_list_datalinks() predates the introduction of
PCAP_ERROR, so the presence of pcap_list_datalinks() doesn't guarantee
that PCAP_ERROR is defined.  Change the use of PCAP_ERROR when checking
the result of pcap_list_datalinks() to just check for -1.

Change-Id: Id8229b7aebd02eaf3701983f9343503397af4fb3
Reviewed-on: https://code.wireshark.org/review/19351
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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