This fixes a compile issue introduced with linux kernel 4.15

include/linux/in.h:222:8: error: redefinition of 'struct in_pktinfo'
|  struct in_pktinfo {


Upstream-Status: Pending
Signed-off-by: Armin Kuster <akuster808@gmail.com>

Index: openl2tp-1.8/plugins/ppp_unix.c
===================================================================
--- openl2tp-1.8.orig/plugins/ppp_unix.c
+++ openl2tp-1.8/plugins/ppp_unix.c
@@ -25,9 +25,14 @@
 #include <fcntl.h>
 #include <sys/types.h>
 #include <signal.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0)
 #include <net/ethernet.h>
 #include <net/if.h>
 #include <netinet/in.h>
+#endif
+
 #include <arpa/inet.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -41,12 +46,12 @@
 #define __user
 #endif
 #include <sys/ioctl.h>
-#include <linux/if_ether.h>
-#include <linux/if_pppox.h>
 #include <linux/ppp_defs.h>
 #include <linux/if_ppp.h>
+#include <linux/if_pppox.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0)
 #include <linux/if_pppol2tp.h>
-
+#endif
 #include "usl.h"
 #include "l2tp_private.h"