Fix commenting on non-utf8 encoded files (#11916) (#11950)

* Add comment on non-unicode line to force fail

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Just quote/unquote patch

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: zeripath <art27@cantab.net>

integrations/gitea-repositories-meta/user2/repo1.git/objects/90/dcd07da077d1e7cd6032b52d1f79ae2b5f19b2

@@ -0,0 +1,2 @@
+x
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