Update to 1.12.3.

*** 1,6 ****
! /*      $Id: preconv.c,v 1.5 2011/07/24 18:15:14 kristaps Exp $ */
  /*
   * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
--- 1,6 ----
! /*      $Id: preconv.c,v 1.6 2013/06/02 03:52:21 schwarze Exp $ */
  /*
   * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
*** 30,46 ****
  #include <string.h>
  #include <unistd.h>
  
  /* 
   * The read_whole_file() and resize_buf() functions are copied from
!  * read.c, including all dependency code (MAP_FILE, etc.).
   */
  
- #ifndef MAP_FILE
- #define MAP_FILE        0
- #endif
- 
  enum    enc {
          ENC_UTF_8, /* UTF-8 */
          ENC_US_ASCII, /* US-ASCII */
          ENC_LATIN_1, /* Latin-1 */
          ENC__MAX
--- 30,42 ----
  #include <string.h>
  #include <unistd.h>
  
  /* 
   * The read_whole_file() and resize_buf() functions are copied from
!  * read.c, including all dependency code.
   */
  
  enum    enc {
          ENC_UTF_8, /* UTF-8 */
          ENC_US_ASCII, /* US-ASCII */
          ENC_LATIN_1, /* Latin-1 */
          ENC__MAX
*** 269,280 ****
          } 
          
          if (S_ISREG(st.st_mode)) {
                  *with_mmap = 1;
                  fb->sz = (size_t)st.st_size;
!                 fb->buf = mmap(NULL, fb->sz, PROT_READ, 
!                                 MAP_FILE|MAP_SHARED, fd, 0);
                  if (fb->buf != MAP_FAILED)
                          return(1);
          }
  #endif
  
--- 265,275 ----
          } 
          
          if (S_ISREG(st.st_mode)) {
                  *with_mmap = 1;
                  fb->sz = (size_t)st.st_size;
!                 fb->buf = mmap(NULL, fb->sz, PROT_READ, MAP_SHARED, fd, 0);
                  if (fb->buf != MAP_FAILED)
                          return(1);
          }
  #endif