Update XZ Utils to 5.0.4 (third_party)

src/scripts/xzdiff.in

 #!@POSIX_SHELL@
 
 # Copyright (C) 1998, 2002, 2006, 2007 Free Software Foundation
 # Copyright (C) 1993 Jean-loup Gailly
 
 # Modified for XZ Utils by Andrew Dudman and Lasse Collin.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 2 of the License, or
@@ skipping 102 matching lines @@
                 eval "$cmp" - - >&3
             )
           elif # Reject Solaris 8's buggy /bin/bash 2.03.
               echo X | (echo X | eval "$cmp" /dev/fd/5 - >/dev/null 2>&1) 5<&0; then
             xz_status=$(
               exec 4>&1
               ($xz1 -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
                 ( ($xz2 -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null |
                 eval "$cmp" /dev/fd/5 - >&3) 5<&0
             )
+            cmp_status=$?
             case $xz_status in
               *[1-9]*) xz_status=1;;
               *) xz_status=0;;
             esac
+            (exit $cmp_status)
           else
             F=`expr "/$2" : '.*/\(.*\)[-.][ablmtxz2]*$'` || F=$prog
             tmp=
             trap '
               test -n "$tmp" && rm -f "$tmp"
               (exit 2); exit 2
             ' HUP INT PIPE TERM 0
             tmp=`mktemp -t -- "$F.XXXXXX"` || exit 2
             $xz2 -cdfq -- "$2" > "$tmp" || exit 2
             xz_status=$(
@@ skipping 26 matching lines @@
     esac;;
   esac
 else
   echo >&2 "$0: Invalid number of operands; try \`${0##*/} --help' for help"
   exit 2
 fi
 
 cmp_status=$?
 test "$xz_status" -eq 0 || exit 2
 exit $cmp_status