Update samba to 4.1.19. Old one is preserved as service/network/samba/samba36 These changes come from upstream. Local OI changes are: - Modify makefiles to use GCC - Remove Oracle Kerberos-related patches and makefile rules: they require additional support from system Kerberos libraries - Build with samba Heimdal - Enable ads (not tested) (commit: 9b84a96)