Cygwin: enable the use of Dl_info and dladdr()
Cygwin: enable the use of Dl_info and dladdr()

These weren't available in Cygwin at the time our DSO code was
written, but things have changed since.

Fixes #9385

Reviewed-by: Matt Caswell <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9402)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl