ping: remove unnecesary x86 intrinsics #include

This include file is present only on x86 so it breaks non-x86 builds.

Change-Id: I6406b0b36f207b684535961545e95dbba707d267
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vnet/ip/ping.c b/src/vnet/ip/ping.c
index eee2575..d250b79 100755
--- a/src/vnet/ip/ping.c
+++ b/src/vnet/ip/ping.c
@@ -19,7 +19,6 @@
 #include <vnet/fib/ip4_fib.h>
 #include <vnet/fib/fib_entry.h>
 #include <vlib/vlib.h>
-#include <emmintrin.h>
 
 /**
  * @file