Use autoconf defines

clients/finger/main.c

clients/gopher/detach.c

clients/gopher/go500.c

clients/gopher/go500gw.c

clients/rcpt500/query.c

clients/tools/ldapsearch.c

clients/ud/auth.c

clients/ud/globals.c

clients/ud/main.c

clients/ud/print.c

clients/ud/ud.h

clients/ud/util.c