[openssl/openssl] 8aaeb5: Add missing header for memcmp

[Richard Levitte]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.openssl.org/openssl/openssl
  Commit: 8aaeb5d4eb7a558bd694b60f3556997d35015fd1
      https://github.openssl.org/openssl/openssl/commit/8aaeb5d4eb7a558bd694b60f3556997d35015fd1
  Author: Gregor Jasny <gjasny at googlemail.com>
  Date:   2022-07-06 (Wed, 06 Jul 2022)

  Changed paths:
    M test/v3ext.c

  Log Message:
  -----------
  Add missing header for memcmp

CLA: trivial

Reviewed-by: Paul Dale <pauli at openssl.org>
Reviewed-by: Dmitry Belyavskiy <beldmit at gmail.com>
Reviewed-by: Todd Short <todd.short at me.com>
Reviewed-by: Richard Levitte <levitte at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18719)

(cherry picked from commit f9e578e720bb35228948564192adbe3bc503d5fb)