package/linuxptp: fix build with new headers

net_tstamp.h in recent kernel versions requires time.h for clockid_t.

Fixes:
  http://autobuild.buildroot.net/results/93903e8abfeaa7df0b6525033fa63e29f2c9e7ae

Signed-off-by: Artem Panfilov <panfilov.artyom@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 1ab26a8264)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/linuxptp/0002-fix-building-with-new-kernel-headers.patch

@@ -0,0 +1,55 @@
+From d663a483c40939bad58301c256d86da1f3da6cc0 Mon Sep 17 00:00:00 2001
+From: Miroslav Lichvar <mlichvar@redhat.com>
+Date: Tue, 13 Nov 2018 13:16:08 +0100
+Subject: [PATCH] Fix building with new kernel headers.
+
+net_tstamp.h in recent kernel versions requires time.h for clockid_t.
+
+Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
+---
+ clock.c      | 2 +-
+ sk.c         | 1 +
+ timemaster.c | 1 +
+ 3 files changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/clock.c b/clock.c
+index 9c493c3..8533b39 100644
+--- a/clock.c
++++ b/clock.c
+@@ -17,11 +17,11 @@
+  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+  */
+ #include <errno.h>
++#include <time.h>
+ #include <linux/net_tstamp.h>
+ #include <poll.h>
+ #include <stdlib.h>
+ #include <string.h>
+-#include <time.h>
+ #include <sys/queue.h>
+ 
+ #include "address.h"
+diff --git a/sk.c b/sk.c
+index e2b1f28..30162eb 100644
+--- a/sk.c
++++ b/sk.c
+@@ -18,6 +18,7 @@
+  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+  */
+ #include <errno.h>
++#include <time.h>
+ #include <linux/net_tstamp.h>
+ #include <linux/sockios.h>
+ #include <linux/ethtool.h>
+diff --git a/timemaster.c b/timemaster.c
+index 058678f..00db59f 100644
+--- a/timemaster.c
++++ b/timemaster.c
+@@ -22,6 +22,7 @@
+ #include <errno.h>
+ #include <libgen.h>
+ #include <limits.h>
++#include <time.h>
+ #include <linux/net_tstamp.h>
+ #include <net/if.h>
+ #include <signal.h>