Both strdup or malloc failure should raise à err.
Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1905)
Move the dh_method structure into an internal header file and provide
relevant accessors for the internal fields.
Reviewed-by: Richard Levitte <levitte@openssl.org>
