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Subject: kill pre-beta-6 rcp support
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Get rid of the really ancient support for encrypted user-to-user transfers in rcp.  With that, we 
also get rid of the need for krb5_set_config_files (which, while exported from libkrb5, is 
considered a private interface and therefore subject to removal) in our tree, and so can probably 
remove that function.  (But see also ticket 5784.)