generator: Remove generated and unused files from previous runs of the generator.

If you go back in time in git (eg. git reset, git bisect) then you can
end up in a situation where a file that was generated by a later
version is left around unused in the earlier version.

This isn't a problem for most things, but gobject documentation
generation picks up any file in a directory, even unreferenced ones,
and breaks.  So the correct thing to do is to remove these files.

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