If it bothers enough to fix, add a .gitattributes file that is committed in the root of the git repository.
This file should contain the following:
# no eol conversions!
* -text
Then everyone will commit their own kind of eol.
Whether KSP will read save games with non-native eol is to be tested. Perhaps it is better if everyone participating switches to macOs (ducks and covers )
Can you EVA him to a safe distance and have him wait about 3 Kerbal Years, 46 Kerbal days, or do he need to start the process with no hope of EVA in time?