Use OPENSSL_strdup() for strings freed by OPENSSL_free()

Use OPENSSL_strdup() for strings freed by OPENSSL_free()

Things can get messy when application decides to use it's own memory
allocation functions using CRYPTO_set_mem_functions(3ossl)

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27163)

(cherry picked from commit 7fa51041e4d68838b2c7ddf4f77d6bba0edf2735)