Zap LDAPv2-only stuff

clients/Makefile.in

clients/mail500/Makefile.in

clients/mail500/README

clients/mail500/mail500.m4

clients/mail500/main.c

clients/mail500/sendmail.cf

clients/maildap/Makefile.in

clients/maildap/README

clients/maildap/maildap.m4

clients/maildap/main.c

clients/ud/Makefile.in

clients/ud/auth.c

clients/ud/edit.c

clients/ud/etc.ud.conf

clients/ud/find.c

clients/ud/globals.c

clients/ud/group.c

clients/ud/help.c

clients/ud/main.c

clients/ud/mod.c