ppp: fix building with linux-4.8

Fix a build error when using the linux-4.8 headers that results in:

In file included from pppoe.h:87:0,
                 from plugin.c:29:
../usr/include/netinet/in.h:211:8: note: originally defined here
 struct in6_addr
        ^~~~~~~~
In file included from ../usr/include/linux/if_pppol2tp.h:20:0,
                 from ../usr/include/linux/if_pppox.h:26,
                 from plugin.c:52:
../usr/include/linux/in6.h:49:8: error: redefinition of 'struct sockaddr_in6'
 struct sockaddr_in6 {
        ^~~~~~~~~~~~

(From OE-Core rev: 68e917aa778742da104c038a6e1ffa789fe95410)

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-connectivity/ppp/ppp/ppp-fix-building-with-linux-4.8.patch

@@ -0,0 +1,44 @@
+From 3da19af53e2eee2e77b456cfbb9d633b06656d38 Mon Sep 17 00:00:00 2001
+From: Jackie Huang <jackie.huang@windriver.com>
+Date: Thu, 13 Oct 2016 13:41:43 +0800
+Subject: [PATCH] ppp: fix building with linux-4.8
+
+Fix a build error when using the linux-4.8 headers that results in:
+
+In file included from pppoe.h:87:0,
+                 from plugin.c:29:
+../usr/include/netinet/in.h:211:8: note: originally defined here
+ struct in6_addr
+        ^~~~~~~~
+In file included from ../usr/include/linux/if_pppol2tp.h:20:0,
+                 from ../usr/include/linux/if_pppox.h:26,
+                 from plugin.c:52:
+../usr/include/linux/in6.h:49:8: error: redefinition of 'struct sockaddr_in6'
+ struct sockaddr_in6 {
+        ^~~~~~~~~~~~
+
+Upstream-Status: Submitted [1]
+
+[1] https://github.com/paulusmack/ppp/pull/69
+
+Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
+---
+ pppd/plugins/rp-pppoe/pppoe.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/pppd/plugins/rp-pppoe/pppoe.h b/pppd/plugins/rp-pppoe/pppoe.h
+index 9ab2eee..96d2794 100644
+--- a/pppd/plugins/rp-pppoe/pppoe.h
++++ b/pppd/plugins/rp-pppoe/pppoe.h
+@@ -84,7 +84,7 @@ typedef unsigned long UINT32_t;
+ #include <linux/if_ether.h>
+ #endif
+ 
+-#include <netinet/in.h>
++#include <linux/in.h>
+ 
+ #ifdef HAVE_NETINET_IF_ETHER_H
+ #include <sys/types.h>
+-- 
+2.8.3
+

meta/recipes-connectivity/ppp/ppp_2.4.7.bb

@@ -30,6 +30,7 @@ SRC_URI = "http://ppp.samba.org/ftp/ppp/ppp-${PV}.tar.gz \
            file://0001-ppp-Fix-compilation-errors-in-Makefile.patch \
            file://ppp@.service \
            file://fix-CVE-2015-3310.patch \
+           file://ppp-fix-building-with-linux-4.8.patch \
 "
 
 SRC_URI_append_libc-musl = "\