methods :
 - EVP_PBE_scrypt
 - EVP_PKEY_meth_add0
 - EVP_PKEY_meth_new
 - EVP_PKEY_CTX_dup
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NBernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: NMatthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/5783)