Fixed ignored cmt_sp_after_star_cont in output_comment_c, see details

Example:
  int cnt;    /* This is a counter variable with a long comment. */

After uncrustify with cmt_sp_after_star_cont=1:
  int cnt;    /* This is a counter variable
               *with a long comment. */

With this patch it adds the space between the second star and the
comment:
  int cnt;    /* This is a counter variable
               * with a long comment. */