reduce space used by Formaline's temporary files

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Issue #2316 open
Roland Haas created an issue

Formaline creates tarballs of the source code to be included in the executable. Some of the files created are used only for the tarballs and will be recreated whenever the tarballs need updating (ie they cannot be re-used).

It is therefore possible to remove these files once the tarballs have been created freeing a couple hundred MB of disk space.