.arcconfig

tests: stabilize test-fix.t on Windows

`pwd` prints /tmp/... style paths, not C:\... needed for $TESTTMP to be
substituted.

In the final test, for whatever reason, Windows was missing EOL in the files and
printing:

    [wdir] changedlines: printf: warning: ignoring excess arguments, starting
       with 'printf'

even though it was trying to run:

    printf "Line ranges:\n"; printf "2 through 2\n";

I tried wrapping both :command and :linerange in `sh -c "..."`, and while that
fixed the missing EOL, it missed the "2 through 2" output.

Differential Revision: https://phab.mercurial-scm.org/D6852

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