Support multibin to allow multiple binary models to co-exist.
This change parallels the implementation of multilib and initially
only applies to the NonStop platform's DLL loader limitations.
Fixes: #16460 Signed-off-by: Randall S. Becker <rsbecker@nexbridge.com> Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16472)