Update auxiliary maintainer mode build tools

* git-set-file-times: Update from rsync.
* git-version-gen: Update from gnulib.
* gitlog-to-changelog: Likewise.

Author: ldv-alt

git-set-file-times

@@ -1,5 +1,6 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 use strict;
+use warnings;
 
 # Sets mtime and atime of files to the latest commit time in git.
 #

git-version-gen

@@ -1,8 +1,8 @@
 #!/bin/sh
 # Print a version string.
-scriptversion=2012-12-31.23; # UTC
+scriptversion=2014-12-02.19; # UTC
 
-# Copyright (C) 2007-2013 Free Software Foundation, Inc.
+# Copyright (C) 2007-2014 Free Software Foundation, Inc.
 #
 # 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
@@ -85,8 +85,9 @@ Print a version string.
 
 Options:
 
-   --prefix           prefix of git tags (default 'v')
-   --fallback         fallback version to use if \"git --version\" fails
+   --prefix PREFIX    prefix of git tags (default 'v')
+   --fallback VERSION
+                      fallback version to use if \"git --version\" fails
 
    --help             display this help and exit
    --version          output version information and exit
@@ -214,7 +215,7 @@ if test "x$v_from_git" != x; then
 fi
 
 # Omit the trailing newline, so that m4_esyscmd can use the result directly.
-echo "$v" | tr -d "$nl"
+printf %s "$v"
 
 # Local variables:
 # eval: (add-hook 'write-file-hooks 'time-stamp)