setup's response to a "corrupt local copy"

[Ken Brown <kbrown at cornell dot edu>]

This is a followup to the discussion started here:

  https://cygwin.com/ml/cygwin/2017-12/msg00088.html

When setup is preparing to download files and it finds a corrupt copy in 
the local cache, it issues a fatal error message telling the user to 
remove the corrupt file and retry.  Steven said that setup should 
silently delete the corrupt file, while I argued in favor of the current 
behavior, on the grounds that setup shouldn't be deleting user files if 
it doesn't know where they came from.

There is a middle ground: setup could query the user.  Additionally, as 
suggested by cyg Simple, there could be an option that directs setup to 
silently remove corrupt files.

Ken

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