sed 4.2.1-1 locks files on windows

[<cygwin dot com at munub dot e4ward dot com>]

see here: http://stackoverflow.com/questions/9368783/cygwin-bash-sed-locks-my-files

When I change files in cygwin bash with the sed command, the file gets locked.

Reproduce:

    Open cmd and cd to non-user directory (f.e. temp)
    echo aaa > test.txt
    Open in texteditor, add line, try to save => works
    %CYGWIN_HOME%\bin\bash -c "sed -i 's/aaa/bbb/' test.txt
    In texteditor, add another line and try to save => "Access denied"

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