[Toybox] [PATCH] diff: implement --strip-trailing-cr.

[enh]

Used by some ART tests and also some LLVM tests. (The motivating example
is the latter, but I noticed the former when looking for other users.)

Bug: http://b/137298656
---
 tests/diff.test     |  5 +++++
 toys/pending/diff.c | 50 ++++++++++++++++++++++++++++-----------------
 2 files changed, 36 insertions(+), 19 deletions(-)
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