xxx hangs 'make release' with synApps_6_1

[kmpeters]

The problem was discussed on tech-talk here:

https://epics.anl.gov/tech-talk/2022/msg01242.php

Outstanding questions:

1. Which OS?
2. Are other versions of synApps affected?

[keenanlang]

I have seen similar issues crop up before.

I believe I remember it having something to do with recursive includes in release files.