OpenSSL version check in check_revocation_ocsp()

[dcooper16]

Describe your changes

The current code for setting $host_header in check_revocation_ocsp() will not work for LibreSSL 3.*. In addition, the code uses $OPENSSL2, which is not defined. This PR fixes these issues.

What is your pull request about?

• Bug fix
• Improvement
• New feature (adds functionality)
• Breaking change (bug fix, feature or improvement that would cause existing functionality to not work as expected)
• Typo fix
• Documentation update
• Update of other files

If it's a code change please check the boxes which are applicable

• For the main program: My edits contain no tabs, indentation is five spaces and any line endings do not contain any blank chars
• I've read CONTRIBUTING.md and Coding_Convention.md
• I have tested this fix or improvement against >=2 hosts and I couldn't spot a problem
• I have tested this new feature against >=2 hosts which show this feature and >=2 host which does not (in order to avoid side effects) . I couldn't spot a problem
• For the new feature I have made corresponding changes to the documentation and / or to help()
• If it's a bigger change: I added myself to CREDITS.md (alphabetical order) and the change to CHANGELOG.md

[drwetter]

Hi David,
quick shot: OPENSSL2 is defined in the very beginning at L248. is not defined in 3.0 but in 3.2. Shouldn't it be better to define it in the very beginning like in 3.2 ?

[dcooper16]

quick shot: OPENSSL2 is defined in the very beginning at L248. is not defined in 3.0 but in 3.2. Shouldn't it be better to define it in the very beginning like in 3.2 ?

Okay. I changed the PR to define OPENSSL2.

[drwetter]

Works also like a charm. Cool & thanks!