fix runtime dependency

package/wpa_supplicant/Makefile

@@ -9,7 +9,7 @@ PKG_RELEASE:=		1
 PKG_MD5SUM:=		238e8e888bbd558e1a57e3eb28d1dd07
 PKG_DESCR:=		wpa supplicant
 PKG_SECTION:=		net/wifi
-PKG_DEPENDS:=		libnl
+PKG_DEPENDS:=		libnl librt
 PKG_BUILDDEP:=		libnl
 PKG_URL:=		http://hostap.epitest.fi/wpa_supplicant/
 PKG_SITES:=		http://hostap.epitest.fi/releases/