windows hook scripts newlines without CR

windows hook scripts newlines without CR

Windows: When git-annex init is installing hook scripts, it will
avoid ending lines with CR for portability.

Existing hook scripts that do have CR line endings will not be changed.
While it would be possible to have git-annex init upgrade them, users would
need to know to use that command to do that, and it would add complexity
that does not seem warranted for the portability benefit alone.

Sponsored-by: Luke T. Shumaker on Patreon