[Rpm-maint] [rpm-software-management/rpm] fix install rpmrc, platform and macros files with off-source-tree build (PR #2651)

[Michal Domonkos]

Reproducer:
```
$ cmake -B /path/to/build/dir -C /path/to/rpm/source/dir
$ cmake --install /path/to/build/dir
```

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