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>