feat(checkpkg): enhance diff command for comparing file lists

Jakub Klinkovskýrequested to merge
lahwaacz/devtools:checkpkg into master

Replace sdiff with diff (also from diffutils) with the following parameters:

  • --side-by-side for the sdiff-like output
  • --suppress-common-lines for the sdiff -s behavior
  • --width="$COLUMNS" to use the full terminal width (long lines are still truncated but it is definitely better than the default width of 130 chars)
  • --color=auto just because 😉

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