Reland "Use core.quotePath=false when git is listing files"

This is a reland of 9219d356885a93d9cbcaf4a2c7fc3f6e29caad49

The original was reverted due to a typo (core,quotePath instead
of core.quotePath). This version is fixed.

Original change's description:
> Use core.quotePath=false when git is listing files
>
> This prevents git from putting quotes around some file names
> (those that have astral-plane characters) and not around others.
>
> R=maruel
>
> Bug: 792302
>
> Change-Id: I3b6a6b36c4720116de811b40177b59aa25c263db
> Reviewed-on: https://chromium-review.googlesource.com/815454
> Commit-Queue: Aaron Gable <agable@chromium.org>
> Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>

Bug: 792302
Recipe-Nontrivial-Roll: build
Recipe-Nontrivial-Roll: build_limited_scripts_slave
Change-Id: I28d2260948aaf63bd865888c2f60e4cdee9aea48
Reviewed-on: https://chromium-review.googlesource.com/822990
Commit-Queue: Aaron Gable <agable@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
diff --git a/git_cl.py b/git_cl.py
index e7d5c26..b83a053 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -5363,7 +5363,8 @@
       print('Your patch doesn\'t apply cleanly to \'%s\' HEAD @ %s, '
             'the following files have merge conflicts:' %
             (branch, parent_hash))
-      print(RunGit(['diff', '--name-status', '--diff-filter=U']).strip())
+      print(RunGit(['-c', 'core.quotePath=false', 'diff',
+                    '--name-status', '--diff-filter=U']).strip())
       print('Please rebase your patch and try again.')
       RunGitWithCode(['cherry-pick', '--abort'])
       break