[PATCH 1 of 2 STABLE] diffhelpers: add canstripcr=True to fix_newline

[Jun Wu]

Excerpts from Yuya Nishihara's message of 2017-04-28 21:21:32 +0900:
> The key difference is version-per-module or version-per-function.
> Historically we chose the latter probably because we wanted to run bisect
> without recompiling C modules, which is slow. I don't think there's big
> reason to rethink about the versioning strategy.

That difference is for cases where modulepolicy is set to 'allow'.

When modulepolicy is 'c' (the default), my code works by triggering an auto
build.  I couldn't think of better solutions for 'c' policy.  This is also
what I think blocks the issue4042 fix.

> [...]