Add explicit support in util/shlib_wrap.sh.in for NonStop DLL loading.

Add explicit support in util/shlib_wrap.sh.in for NonStop DLL loading.

The NonStop platform uses a proprietary mechanism for specifying DLL
locations.

CLA: Permission is granted by the author to the OpenSSL team to use these modifications.

Fixes #14666

Signed-off-by: Randall S. Becker <rsbecker@nexbridge.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14669)