wpa_supplicant: bump version

Patch by Gustavo Zacarias <gustavo@zacarias.com.ar>, closes #213.

package/wpa_supplicant/wpa_supplicant.mk

@@ -4,7 +4,7 @@
 #
 #############################################################
 
-WPA_SUPPLICANT_VERSION = 0.6.8
+WPA_SUPPLICANT_VERSION = 0.6.9
 WPA_SUPPLICANT_SOURCE = wpa_supplicant-$(WPA_SUPPLICANT_VERSION).tar.gz
 WPA_SUPPLICANT_SITE = http://hostap.epitest.fi/releases
 WPA_SUPPLICANT_LIBTOOL_PATCH = NO