testscript: relax constraints around actual source in cmp with update #107
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There are currently constraints on the actual source for a failed cmp
comparison when Params.UpdateScripts is true: the actual must be either
stdout or stderr.
However it's unclear why this constraint is necessary.
Indeed it's a painful constraint when the actual source in a comparison
is file written by a previous command.
Relax this constraint because, after discussion with @mvdan
and @rogpeppe, we believe it safe to do so.
Add a test for this new logic where the actual is a file that is part of
the archive.