Merge branch 'jk/unused-post-2.42-part2'

Unused parameters to functions are marked as such, and/or removed,
in order to bring us closer to -Wunused-parameter clean.

* jk/unused-post-2.42-part2:
  parse-options: mark unused parameters in noop callback
  interpret-trailers: mark unused "unset" parameters in option callbacks
  parse-options: add more BUG_ON() annotations
  merge: do not pass unused opt->value parameter
  parse-options: mark unused "opt" parameter in callbacks
  parse-options: prefer opt->value to globals in callbacks
  checkout-index: delay automatic setting of to_tempfile
  format-patch: use OPT_STRING_LIST for to/cc options
  merge: simplify parsing of "-n" option
  merge: make xopts a strvec

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