[Rpm-maint] [rpm-software-management/rpm] Add a %cnl (continue next line) marker (#787)

[pavlinamv]

You can use %{shrink:...} this way:
```%global godocs         docs examples code-of-conduct.md %{shrink:\```
```                       }README.md```
"godocs" will be defined:
```xdocs examples code-of-conduct.md README.md```

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