libpcap: Fix build when PACKAGECONFIG ipv6 is not enable

libpcap: Fix build when PACKAGECONFIG ipv6 is not enable

Add patches to fix error:
/
| ERROR: oe_runmake failed
| config.status: creating pcap-config.tmp
| mv pcap-config.tmp pcap-config
| chmod a+x pcap-config
| ../libpcap-1.8.1/gencode.c: In function 'pcap_compile':
| ../libpcap-1.8.1/gencode.c:693:8: error: 'compiler_state_t
| {aka struct _compiler_state}' has no member named 'ai'
|   cstate.ai = NULL;
|         ^
| ../libpcap-1.8.1/gencode.c: In function 'gen_gateway':
| ../libpcap-1.8.1/gencode.c:4914:13: error: 'cstate' undeclared
| (first use in this function)
|    bpf_error(cstate, "direction applied to 'gateway'");
|              ^~~~~~
| ../libpcap-1.8.1/gencode.c:4914:13: note: each undeclared identifier is
| reported only once for each function it appears in
\

Patches were submitted to upstream [1]

[1] https://github.com/the-tcpdump-group/libpcap/pull/541

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Ross Burton <ross.burton@intel.com>