2004-07-12  Mark McLoughlin  <mark@skynet.ie>

        Support building without GNU TLS.

        * configure.in: only warn if gnutls or libgcrypt isn't
        found.

        * server/libvncserver/auth.c,
          server/libvncserver/main.c,
          server/libvncserver/rfb/rfb.h,
          server/libvncserver/rfb/rfbproto.h,
          server/libvncserver/rfbserver.c,
          server/libvncserver/sockets.c,
          server/libvncserver/vncauth.c,
          server/vino-main.c,
          server/vino-server.c,
          server/vino-util.[ch]: add a bunch of #ifdef HAVE_GNUTLS.