[windows] Fix major bug where the uninstaller removes non-Ekiga files
This case appeared when Ekiga is installed in a non-empty directory, because the uninstaller removes the whole install directory, hence other files too. The simplest solution I found is that if the installation directory is not empty (such as MyDocs), then it is installed into an empty sub-directory. Thus, even when the uninstall removes the whole sub-directory, there is no problem.
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