[vala/0.54] build: Update git-version-gen to latest upstream

[Rico Tzschichholz <ricotz src gnome org>]

commit 1eb0925964de81685fc7d5f60a4377a05b4054a4
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Dec 1 17:11:42 2021 +0100

    build: Update git-version-gen to latest upstream
    
    From commit 378351df7e63daca234c581f086b542026e07a27 of
    https://git.savannah.gnu.org/cgit/autoconf.git/tree/build-aux/git-version-gen

 build-aux/git-version-gen | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)
---
diff --git a/build-aux/git-version-gen b/build-aux/git-version-gen
index 0e254f4be..959f98893 100755
--- a/build-aux/git-version-gen
+++ b/build-aux/git-version-gen
@@ -1,8 +1,8 @@
 #!/bin/sh
 # Print a version string.
-scriptversion=2017-09-13.06; # UTC
+scriptversion=2019-10-13.15; # UTC
 
-# Copyright (C) 2007-2017 Free Software Foundation, Inc.
+# Copyright (C) 2007-2021 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
@@ -72,9 +72,10 @@ scriptversion=2017-09-13.06; # UTC
 
 me=$0
 
+year=`expr "$scriptversion" : '\([^-]*\)'`
 version="git-version-gen $scriptversion
 
-Copyright 2011 Free Software Foundation, Inc.
+Copyright $year Free Software Foundation, Inc.
 There is NO warranty.  You may redistribute this software
 under the terms of the GNU General Public License.
 For more information about these matters, see the files named COPYING."
@@ -141,11 +142,9 @@ then
     v=`cat $tarball_version_file` || v=
     case $v in
         *$nl*) v= ;; # reject multi-line output
-        [0-9]*) ;;
-        *) v= ;;
     esac
     test "x$v" = x \
-        && echo "$0: WARNING: $tarball_version_file is missing or damaged" 1>&2
+        && echo "$0: WARNING: $tarball_version_file is damaged" 1>&2
 fi
 
 if test "x$v" != x
@@ -219,7 +218,7 @@ fi
 printf %s "$v"
 
 # Local variables:
-# eval: (add-hook 'write-file-hooks 'time-stamp)
+# eval: (add-hook 'before-save-hook 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
 # time-stamp-time-zone: "UTC0"