ptrace: include config.h in ptrace.h

CONFIG_HAS_PEEKSIGINFO_ARGS is used there.

Cc: Christopher Covington <cov@codeaurora.org>
Reported-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/ptrace.h

@@ -4,6 +4,8 @@
 #include <linux/types.h>
 #include <sys/ptrace.h>
 
+#include "config.h"
+
 /* some constants for ptrace */
 #ifndef PTRACE_SEIZE
 # define PTRACE_SEIZE		0x4206