package/wpa_supplicant: use correct include path for libnl-3.0

Fixes:
ERROR: unsafe header/library path used in cross-compilation: '/usr/include/libnl3'

Add a dependancy on host-pkgconf when BR2_PACKAGE_LIBNL is enabled.

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Reported-by: Jörg Krause <jkrause@posteo.de>
Cc: Jörg Krause <jkrause@posteo.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/wpa_supplicant/0002-use-correct-include-path-for-libnl-3.0.patch

@@ -0,0 +1,26 @@
+From 4426de35f0e5dd5b0152474ce6a885b73de60656 Mon Sep 17 00:00:00 2001
+From: Romain Naour <romain.naour@openwide.fr>
+Date: Tue, 16 Dec 2014 23:50:33 +0100
+Subject: [PATCH 2/2] use correct include path for libnl-3.0
+
+Signed-off-by: Romain Naour <romain.naour@openwide.fr>
+---
+ src/drivers/drivers.mak | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/drivers/drivers.mak b/src/drivers/drivers.mak
+index cdb913e..e9fc83c 100644
+--- a/src/drivers/drivers.mak
++++ b/src/drivers/drivers.mak
+@@ -35,7 +35,7 @@ NEED_RFKILL=y
+ ifdef CONFIG_LIBNL32
+   DRV_LIBS += -lnl-3
+   DRV_LIBS += -lnl-genl-3
+-  DRV_CFLAGS += -DCONFIG_LIBNL20 -I/usr/include/libnl3
++  DRV_CFLAGS += -DCONFIG_LIBNL20 `pkg-config --cflags libnl-3.0`
+ ifdef CONFIG_LIBNL3_ROUTE
+   DRV_LIBS += -lnl-route-3
+   DRV_CFLAGS += -DCONFIG_LIBNL3_ROUTE
+-- 
+1.9.3
+

package/wpa_supplicant/wpa_supplicant.mk

@@ -35,7 +35,7 @@ ifeq ($(BR2_PACKAGE_LIBNL),y)
 ifeq ($(BR2_STATIC_LIBS),y)
 	WPA_SUPPLICANT_LIBS += -lnl-3 -lm -lpthread
 endif
-	WPA_SUPPLICANT_DEPENDENCIES += libnl
+	WPA_SUPPLICANT_DEPENDENCIES += host-pkgconf libnl
 	WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_LIBNL32
 else
 	WPA_SUPPLICANT_CONFIG_DISABLE += CONFIG_DRIVER_NL80211