network-manager: adjust license info

libgsystem is gone, so remove that section. Fixes:
http://autobuild.buildroot.net/results/4b9/4b9826f540b8da43c0434769ad9485529cf762e6/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/network-manager/network-manager.mk

@@ -11,8 +11,8 @@ NETWORK_MANAGER_SITE = http://ftp.gnome.org/pub/GNOME/sources/NetworkManager/$(N
 NETWORK_MANAGER_INSTALL_STAGING = YES
 NETWORK_MANAGER_DEPENDENCIES = host-pkgconf udev dbus-glib libnl gnutls \
 	libgcrypt wireless_tools util-linux host-intltool readline libndp
-NETWORK_MANAGER_LICENSE = GPLv2+ (app), LGPLv2+ (libnm-util, libgsystem)
-NETWORK_MANAGER_LICENSE_FILES = COPYING libnm-util/COPYING libgsystem/COPYING
+NETWORK_MANAGER_LICENSE = GPLv2+ (app), LGPLv2+ (libnm-util)
+NETWORK_MANAGER_LICENSE_FILES = COPYING libnm-util/COPYING
 
 NETWORK_MANAGER_CONF_ENV = \
 	ac_cv_path_LIBGCRYPT_CONFIG=$(STAGING_DIR)/usr/bin/libgcrypt-config \