Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15968)
### Changes between 3.0 and 3.1 [xx XXX xxxx]
+ * The PVK key derivation function has been moved from b2i_PVK_bio_ex() into
+ the legacy crypto provider as an EVP_KDF. Applications requiring this KDF
+ will need to load the legacy crypto provider.
+
+ *Paul Dale*
+
* The various OBJ_* functions have been made thread safe.
*Paul Dale*