package/libnetfilter_conntrack: fix musl build with headers >= 5.15

Fix the following build failure with musl and headers >= 5.15 raised
since bump to version 1.0.9 in commit
9af9dfa543907c46091c706b0f3a0eb89445ae74:

In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-musleabihf/sysroot/usr/include/arpa/inet.h:9,
                 from ../../include/internal/internal.h:14,
                 from proto.c:2:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-musleabihf/sysroot/usr/include/netinet/in.h:23:8: error: redefinition of 'struct in6_addr'
   23 | struct in6_addr {
      |        ^~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/19931aba8bee8867a53130ca4a53cfadbc4c5bfd

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/libnetfilter_conntrack/0001-conntrack-fix-build-with-kernel-5-15-and-musl.patch

@@ -0,0 +1,60 @@
+From 21ee35dde73aec5eba35290587d479218c6dd824 Mon Sep 17 00:00:00 2001
+From: Robert Marko <robimarko@gmail.com>
+Date: Thu, 24 Feb 2022 15:01:11 +0100
+Subject: conntrack: fix build with kernel 5.15 and musl
+
+Currently, with kernel 5.15 headers and musl building is failing with
+redefinition errors due to a conflict between the kernel and musl headers.
+
+Musl is able to suppres the conflicting kernel header definitions if they
+are included after the standard libc ones, however since ICMP definitions
+were moved into a separate internal header to avoid duplication this has
+stopped working and is breaking the builds.
+
+It seems that the issue is that <netinet/in.h> which contains the UAPI
+suppression defines is included in the internal.h header and not in the
+proto.h which actually includes the kernel ICMP headers and thus UAPI
+supression defines are not present.
+
+Solve this by moving the <netinet/in.h> include before the ICMP kernel
+includes in the proto.h
+
+Fixes: bc1cb4b11403 ("conntrack: Move icmp request>reply type mapping to common file")
+Signed-off-by: Robert Marko <robimarko@gmail.com>
+Signed-off-by: Florian Westphal <fw@strlen.de>
+
+[Retrieved from:
+https://git.netfilter.org/libnetfilter_conntrack/commit/?id=21ee35dde73aec5eba35290587d479218c6dd824]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ include/internal/internal.h | 1 -
+ include/internal/proto.h    | 1 +
+ 2 files changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/include/internal/internal.h b/include/internal/internal.h
+index 2ef8a90..7cd7c44 100644
+--- a/include/internal/internal.h
++++ b/include/internal/internal.h
+@@ -14,7 +14,6 @@
+ #include <arpa/inet.h>
+ #include <time.h>
+ #include <errno.h>
+-#include <netinet/in.h>
+ 
+ #include <libnfnetlink/libnfnetlink.h>
+ #include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+diff --git a/include/internal/proto.h b/include/internal/proto.h
+index 40e7bfe..60a5f4e 100644
+--- a/include/internal/proto.h
++++ b/include/internal/proto.h
+@@ -2,6 +2,7 @@
+ #define _NFCT_PROTO_H_
+ 
+ #include <stdint.h>
++#include <netinet/in.h>
+ #include <linux/icmp.h>
+ #include <linux/icmpv6.h>
+ 
+-- 
+cgit v1.2.3
+