[openssl/openssl] 0d4a86: quic ddd demos: update makefile and demo sources

[James Muir]

  Branch: refs/heads/openssl-3.2
  Home:   https://github.com/openssl/openssl
  Commit: 0d4a8667e25406b39785c6d4a25b34a825eb798a
      https://github.com/openssl/openssl/commit/0d4a8667e25406b39785c6d4a25b34a825eb798a
  Author: James Muir <james at openssl.org>
  Date:   2023-11-01 (Wed, 01 Nov 2023)

  Changed paths:
    M doc/designs/ddd/Makefile
    M doc/designs/ddd/ddd-01-conn-blocking.c
    M doc/designs/ddd/ddd-02-conn-nonblocking-threads.c
    M doc/designs/ddd/ddd-02-conn-nonblocking.c
    M doc/designs/ddd/ddd-03-fd-blocking.c
    M doc/designs/ddd/ddd-04-fd-nonblocking.c
    M doc/designs/ddd/ddd-05-mem-nonblocking.c
    M doc/designs/ddd/ddd-06-mem-uv.c

  Log Message:
  -----------
  quic ddd demos: update makefile and demo sources

Update makefile and fix some signedness issues in the demo sources.
Drop stray "\n" in the host-port format string that prevented ddd-01
from working (this was also noticed by Neil H). Also, determine the
length of the message we are sending and send that many bytes (rather
than send sizeof the buffer storing the message).

These changes are part of https://github.com/openssl/project/issues/253

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22542)

(cherry picked from commit d1338fcf12672ef4a3d417f5dd03e342710ee5b3)