[openssl/openssl] 58e8af: Set RC4 defines on libcrypto/liblegacy

[Tomáš Mráz]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 58e8af4cecd23dbea2e6b061ab68190b38d64145
      https://github.com/openssl/openssl/commit/58e8af4cecd23dbea2e6b061ab68190b38d64145
  Author: Tomas Mraz <tomas at openssl.org>
  Date:   2023-06-10 (Sat, 10 Jun 2023)

  Changed paths:
    M crypto/rc4/build.info
    M providers/implementations/ciphers/cipher_rc4_hmac_md5.h

  Log Message:
  -----------
  Set RC4 defines on libcrypto/liblegacy

Also add missing prototype for rc4_md5_enc.

Fixes #21150

Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21153)