Filter invalid files like *.dsa, *.sf in the jar
Filter invalid files like *.dsa, *.sf in the jar

Since we copy the existing jar file to a location, we also need to
inspect it and clean it up if it's already present. We also do the
proper cleaning up in the new files before they are written to the
archive.

pparkkin/eta,AlexeyRaga/eta,rahulmutt/ghcvm,pparkkin/eta,alexander-at-github/eta,rahulmutt/ghcvm,AlexeyRaga/eta,rahulmutt/ghcvm,alexander-at-github/eta,rahulmutt/ghcvm,AlexeyRaga/eta,pparkkin/eta,pparkkin/eta,pparkkin/eta,AlexeyRaga/eta,rahulmutt/ghcvm,AlexeyRaga/eta,alexander-at-github/eta,alexander-at-github/eta,alexander-at-github/eta