The recent sed update in cygwin [1] changed the way sed handles
carriage returns. This meant that every .in file we processed
still contained CR, which doesn't work for .sh files.
Force LF line endings for those files (and also other shell scripts).
[1] https://cygwin.com/ml/cygwin-announce/2017-02/msg00036.html
This set of .gitattributes was automatically generated from the list of files
that GIT tried to normalize when I enabled automatic EOL conversion.
With this set of attributes, we prevent automated EOL conversion on files that
we know will cause trouble down the road.
