distmaker - Autogenerate civicrm-*-patchset.tar.gz

[totten]

Overview

civicrm-*-patchset.tar.gz is an artifact included with ESR builds. It provides a list of recent patches. This updates distmaker to generate the file in the same way.

Before

Generating the file requires a special workflow.

After

The file is created automatically.

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).

[eileenmcnaughton]

Realistically this has had input from the only 2 people likely to follow it - merging