libpcap: Fix build when PACKAGECONFIG ipv6 is not enabled

Add patches provided upstream [1] by Fabio Berton to fix error:

> ./gencode.c: In function 'pcap_compile':
> ./gencode.c:693:8: error: 'compiler_state_t {aka struct _compiler_state}' has no member named 'ai'
>   cstate.ai = NULL;
>         ^
> ./gencode.c: In function 'gen_gateway':
> ./gencode.c:4914:13: error: 'cstate' undeclared (first use in this function)
>    bpf_error(cstate, "direction applied to 'gateway'");
>              ^

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

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Tested-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/package/libs/libpcap/patches/001-Fix-compiler_state_t.ai-usage-when-INET6-is-not-defi.patch b/package/libs/libpcap/patches/001-Fix-compiler_state_t.ai-usage-when-INET6-is-not-defi.patch
new file mode 100644
index 0000000..edb6ae5
--- /dev/null
+++ b/package/libs/libpcap/patches/001-Fix-compiler_state_t.ai-usage-when-INET6-is-not-defi.patch
@@ -0,0 +1,41 @@
+From 64aa033a061c43fc15c711f2490ae41d23b868c3 Mon Sep 17 00:00:00 2001
+From: Fabio Berton <fabio.berton@ossystems.com.br>
+Date: Thu, 17 Nov 2016 09:44:42 -0200
+Subject: [PATCH 1/2] Fix compiler_state_t.ai usage when INET6 is not defined
+Organization: O.S. Systems Software LTDA.
+
+Fix error:
+
+/
+| ../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;
+\
+
+Upstream-Status: Submitted [1]
+
+[1] https://github.com/the-tcpdump-group/libpcap/pull/541
+
+Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
+---
+ gencode.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/gencode.c b/gencode.c
+index a887f27..e103c70 100644
+--- a/gencode.c
++++ b/gencode.c
+@@ -690,7 +690,9 @@ pcap_compile(pcap_t *p, struct bpf_program *program,
+ 	}
+ 	initchunks(&cstate);
+ 	cstate.no_optimize = 0;
++#ifdef INET6
+ 	cstate.ai = NULL;
++#endif
+ 	cstate.ic.root = NULL;
+ 	cstate.ic.cur_mark = 0;
+ 	cstate.bpf_pcap = p;
+-- 
+2.1.4
+