Docker build fails on Windows due to autocrlf.

[jchv]

Currently, performing

docker build -t mcsema .

in a freshly cloned mcsema repository will fail on Could not find interpreter: bash\r due to script binfmt being intolerant of carriage returns (and bash is as well, IIRC, so running bash directly instead wouldn't do any good.)

I believe this can be remedied simply by adding

*.sh text eol=lf

into a file called .gitattributes in the root of the repository, to ensure that the shell scripts are never converted to crlf.

Existing checkouts on Windows will still have crlf copies of the shell scripts, but new checkouts should no longer have this issue.

I can confirm that converting the shell scripts called by cmake install to UNIX line endings allows a Docker build to succeed.