Proposed reversion-in-the-tarball

[David Edmundson]

Reading the bug comments I'm fairly sure the bug is this
```
             extraFiles.keys() != KBuildSycoca::factoryExtraFiles()
```

Putting keys into a map and back out can change the order, whereas
factoryExtraFiles is fixed. This could always fire.
I haven't tested it, but I'll prepare a patch.

David