Include BIND documentation in Windows zips

Include BIND documentation in Windows zips

As generated documentation files are no longer stored in the BIND Git
repository, put a copy of the PDF version of the BIND ARM generated by
the "docs" GitLab CI job into the Windows zips to make it easily
available to the end users on that platform.

Make sure Windows zips also contain certain documentation files included
in source tarballs to make the contents of each release more consistent
across different platforms.

(cherry picked from commit 549ddca2562de81bb363212b791cbc5f853a321a)