package/wpa_supplicant: fixing "Invalid configuration line"

Default configuration file is wrong for the default compiling options.

Fixes:

Successfully initialized wpa_supplicant
Line 1: unknown global field 'ctrl_interface=/var/run/wpa_supplicant'.
Line 1: Invalid configuration line
'ctrl_interface=/var/run/wpa_supplicant'.
Failed to read or parse configuration '/etc/wpa_supplicant.conf'.

Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit a76294cd6cf4c06a37b326585cb118d561322315)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/wpa_supplicant/wpa_supplicant.conf

@@ -1,4 +1,4 @@
-ctrl_interface=/var/run/wpa_supplicant
+#ctrl_interface=/var/run/wpa_supplicant
 ap_scan=1
 
 network={

package/wpa_supplicant/wpa_supplicant.mk

@@ -184,6 +184,12 @@ WPA_SUPPLICANT_DEPENDENCIES += readline
 WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_READLINE
 endif
 
+ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_CTRL_IFACE),y)
+define WPA_SUPPLICANT_ENABLE_CTRL_IFACE
+	sed -i '/ctrl_interface/s/^#//g' $(TARGET_DIR)/etc/wpa_supplicant.conf
+endef
+endif
+
 ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_WPA_CLIENT_SO),y)
 WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_BUILD_WPA_CLIENT_SO
 define WPA_SUPPLICANT_INSTALL_WPA_CLIENT_SO
@@ -259,6 +265,7 @@ define WPA_SUPPLICANT_INSTALL_TARGET_CMDS
 	$(WPA_SUPPLICANT_INSTALL_PASSPHRASE)
 	$(WPA_SUPPLICANT_INSTALL_DBUS)
 	$(WPA_SUPPLICANT_INSTALL_WPA_CLIENT_SO)
+	$(WPA_SUPPLICANT_ENABLE_CTRL_IFACE)
 endef
 
 define WPA_SUPPLICANT_INSTALL_INIT_SYSTEMD