shield Recommended update for xdm

SUSE-SLE-DESKTOP-12-2015-665

This update for xdm provides the following fixes: - Fix display-manager wrapper: only call TakeDevices in case $DM actually fails to start. (bsc#939594) - Replace font resources for login screen with font face names. For smaller screens the sizes are reduced so they fit the screen better. - Add '-' to font names in etc/X11/xdm/Xresources to avoid confusion.