ITS#10039 Test for SSL_CTX_set_ciphersuites()

This is the new version of the previously closed MR !612 (closed) which I am reopening as explained in the bug tracker.

https://bugs.openldap.org/show_bug.cgi?id=10039#c7

When configuring OpenLDAP using --with-tls=openssl with LibreSSL the configure will fail to detect SSL_export_keyring_material_early() since LibreSSL doesn't support this function yet. However OpenLDAP doesn't actually use this function and only checks for it to ensure a modern OpenSSL API is used. This can be easily solved by checking for an equivalent modern OpenSSL function which both LibreSSL and OpenSSL both support such as SSL_CTX_set_ciphersuites(). Doing this allows the build and tests to succeed with modern LibreSSL versions. This was tested with LibreSSL >= 3.6.

Bug: https://bugs.openldap.org/show_bug.cgi?id=10039

approved this merge request

The commit msg must have the ITS# in front, same as every other commit.

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• 3aa21d40 - ITS#10039 Test for SSL_CTX_set_ciphersuites()

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changed title from configure.ac: Test for SSL_CTX_set_ciphersuites() to ITS#10039 Test for SSL_CTX_set_ciphersuites()

The commit msg must have the ITS# in front, same as every other commit.

Corrected, I should have been more observant.

approved this merge request

added 7 commits

• 3aa21d40...925053a6 - 6 commits from branch openldap:master
• 387e516a - ITS#10039 Test for SSL_CTX_set_ciphersuites()

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added 8 commits

• 387e516a...ec3fafd1 - 7 commits from branch openldap:master
• cb73e60a - ITS#10039 Test for SSL_CTX_set_ciphersuites()

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enabled an automatic merge when the pipeline for c0116f4e succeeds

merged