Xorg security and bug fix update

gdm 3.28.2-16 - Dont bring up login screen if background session gets killed Related: 1680120 3.28.2-15 - sync AllowMultipleSessionsPerUser patch from 7.6 branch Resolves: 1664353 - Create dconf dirs by default Resolves: 1664284 3.28.2-14 - Fix unlock on XDMCP sessions Resolves: 1693060 3.28.2-13...