vim-patch:8.1.2127: the indent.c file is a bit big

Problem:    The indent.c file is a bit big.
Solution:   Move C-indent code a a new cindent.c file.  Move other
            indent-related code to indent.c. (Yegappan Lakshmanan,
            closes vim/vim#5031)

14c01f8348

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/ops.h

@@ -33,8 +33,6 @@ struct block_def {
   colnr_T start_char_vcols;  ///< number of vcols of pre-block char
 };
 
-typedef int (*Indenter)(void);
-
 /// flags for do_put()
 enum {
   PUT_FIXINDENT    = 1,   ///< make indent look nice