package/powertop: fix build failure due to PATH_MAX

Fixes:
 - http://autobuild.buildroot.org/results/a0b3337cf4a827e6566f8b15b6bb180f0dcef7a3

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/powertop/0002-wakeup_xxx.h-include-limits.h.patch

@@ -0,0 +1,54 @@
+From 4c24fdd8e0a42359df7308155b2d43c28a5e02fd Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Mon, 20 May 2019 20:25:00 +0200
+Subject: [PATCH] wakeup_xxx.h: include limits.h
+
+limits.h must be included to define PATH_MAX otherwise build will fail
+on:
+
+In file included from wakeup/wakeup_ethernet.cpp:45:0:
+wakeup/wakeup_ethernet.h:35:16: error: 'PATH_MAX' was not declared in this scope
+  char eth_path[PATH_MAX];
+
+In file included from wakeup/wakeup_usb.cpp:45:0:
+wakeup/wakeup_usb.h:35:16: error: 'PATH_MAX' was not declared in this scope
+  char usb_path[PATH_MAX];
+
+Fixes:
+ - http://autobuild.buildroot.org/results/a0b3337cf4a827e6566f8b15b6bb180f0dcef7a3
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status:
+https://lists.01.org/pipermail/powertop/2019-May/002052.html]
+---
+ src/wakeup/wakeup_ethernet.h | 1 +
+ src/wakeup/wakeup_usb.h      | 1 +
+ 2 files changed, 2 insertions(+)
+
+diff --git a/src/wakeup/wakeup_ethernet.h b/src/wakeup/wakeup_ethernet.h
+index 682bf95..e0fa628 100644
+--- a/src/wakeup/wakeup_ethernet.h
++++ b/src/wakeup/wakeup_ethernet.h
+@@ -25,6 +25,7 @@
+ #ifndef _INCLUDE_GUARD_ETHERNET_WAKEUP_H
+ #define _INCLUDE_GUARD_ETHERNET_WAKEUP_H
+ 
++#include <limits.h>
+ #include <vector>
+ 
+ #include "wakeup.h"
+diff --git a/src/wakeup/wakeup_usb.h b/src/wakeup/wakeup_usb.h
+index f7a1f7e..15898e3 100644
+--- a/src/wakeup/wakeup_usb.h
++++ b/src/wakeup/wakeup_usb.h
+@@ -25,6 +25,7 @@
+ #ifndef _INCLUDE_GUARD_USB_WAKEUP_H
+ #define _INCLUDE_GUARD_USB_WAKEUP_H
+ 
++#include <limits.h>
+ #include <vector>
+ 
+ #include "wakeup.h"
+-- 
+2.20.1
+