Do not convert line ending of image/*.sh files on windows

[jecisc]

Cygwin cannot run scripts with crlf. I added image/*.sh to the gitattributes to not convert their line ending.

[akgrant43]

Hi Cyril,

Which file was causing problems (so I can do a git checkout and manual inspect the file before applying your PR)?

Thanks,
Alistair

[jecisc]

It was buildspurvmmakerimage.sh and all the scripts it calls.

[nicolas-cellier-aka-nice]

Note that there is a workaround: put set -o igncr in your .bash_profile
See https://stackoverflow.com/questions/14598753/running-bash-script-in-cygwin-on-windows-7 for example.

I agree that it's preferable to correctly set the git file attributes and avoid the problem at the source!

[jecisc]

Thank you for the information! I did not knew. I'll probably still try to avoid adding this, like that I'll encounter the problems and do PR to correct them.