97eb826821
Exclude all `.in` files because they may contain unsupported syntax, and
they have to be preprocessed first. For example:
```sh
Error: SHELLCHECK_WARNING:
./src/rpm/systemd-update-helper.in:130:37: warning[SC1083]: This { is literal. Check expression (missing ;/\n?) or quote it.
```
Related to: https://github.com/systemd/systemd/pull/28521
System and Service Manager
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