[openssl/openssl] ed5c0d: hpke.h, thread.h: Add extern "C" for C++ inclusion

[Tomáš Mráz]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: ed5c0dfdf4f2d386fadfadcd8692a521061c772d
      https://github.com/openssl/openssl/commit/ed5c0dfdf4f2d386fadfadcd8692a521061c772d
  Author: Tomas Mraz <tomas at openssl.org>
  Date:   2023-06-30 (Fri, 30 Jun 2023)

  Changed paths:
    M include/openssl/hpke.h
    M include/openssl/thread.h

  Log Message:
  -----------
  hpke.h, thread.h: Add extern "C" for C++ inclusion

Fixes #21305

Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21307)