GitLab

(makefile-backslash-region): Re-imported from cc-mode; modified to
handle makefile-backslash-align.
(makefile-append-backslash, makefile-delete-backslash):
Re-imported from cc-mode.
(makefile-backslashify-current-line): Function deleted.
(makefile-fill-paragraph): New function.
(makefile-mode-map): Bind C-c C-c to comment-region.
(makefile-mode): Set fill-paragraph to makefile-fill-paragraph.