Fixes #1135 on v2.5.x (#1241). Target file name should be relative to…

[robertpanzer]

…tion dir if source dir is given.

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Kind of change

• [x] Bug fix
• [ ] New non-breaking feature
• [ ] New breaking feature
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Description

What is the goal of this pull request?

This PR fixes the behavior of the CLI to automatically set the mkdirs option similar to how the asciidoctor command does it. This was originally reported in #1137 which was fixed on the main branch for the next version 3.0.0 of AsciidoctorJ. Since it got erroneously classified as a breaking change this PR fixes the issue on the v2.5.x branch as well.

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Issue

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Fixes #1241

Release notes

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[robertpanzer]

As discussed will open 2 new PRs with separate changes for setting the mkdirs option and fixing the conversion into these created directories.