Issue #9911 has been reported by Tomoyuki Chikanaga.

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Backport #9911: Backport r45540 to introduce OpenSSL::OPENSSL_LIBRARY_VERSION
https://bugs.ruby-lang.org/issues/9911

* Author: Tomoyuki Chikanaga
* Status: Assigned
* Priority: Normal
* Assignee: Tomoyuki Chikanaga
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Let's backport r45540.
It introduces OpenSSL::OPENSSL_LIBRARY_VERSION. It's a new feature and marked as [EXPERIMENTAL].  So usually it shouldn't be backported to stable branches.
But it's convenient to check linked OpenSSL runtime version, and valuable to confirm openssl security fixes are applied.
A changeset is quite simple.



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