Reorder pieces of header in perl scripts.

The desired order is
- Prologue part 1 (2 lines with #!)
- Program short description
- Copyright and license notice
- Written-by notice
- Program short description (optional)
- Program long description (optional)
- Prologue part 2
- Time stamp
- Code

Reported by Paul Eggert.

* build-aux/announce-gen: Reorder header.
* build-aux/gitlog-to-changelog: Likewise.
* build-aux/useless-if-before-free: Likewise.
* build-aux/prefix-gnulib-mk: Add copyright notice and short
description.
* build-aux/update-copyright: Likewise. Add short description. Bump
time-stamp-line-limit to 200.

1 files changed, 21 insertions, 20 deletions

diff --git a/build-aux/useless-if-before-free b/build-aux/useless-if-before-free
index 0e479a34b4..6ac8aa9196 100755
--- a/build-aux/useless-if-before-free
+++ b/build-aux/useless-if-before-free
@@ -1,5 +1,26 @@
 #!/bin/sh
 #! -*-perl-*-
+
+# Detect instances of "if (p) free (p);".
+# Likewise "if (p != 0)", "if (0 != p)", or with NULL; and with braces.
+
+# Copyright (C) 2008-2019 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
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+# Written by Jim Meyering
+
 # This is a prologue that allows to run a perl script as an executable
 # on systems that are compliant to a POSIX version before POSIX:2017.
 # On such systems, the usual invocation of an executable through execlp()
@@ -15,32 +36,12 @@
 eval 'exec perl -wSx "$0" "$@"'
      if 0;
 
-# Detect instances of "if (p) free (p);".
-# Likewise "if (p != 0)", "if (0 != p)", or with NULL; and with braces.
-
 my $VERSION = '2018-03-07 03:47'; # UTC
 # The definition above must lie within the first 8 lines in order
 # for the Emacs time-stamp write hook (at end) to update it.
 # If you change this file with Emacs, please let the write hook
 # do its job.  Otherwise, update this string manually.
 
-# Copyright (C) 2008-2019 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
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-# Written by Jim Meyering
-
 use strict;
 use warnings;
 use Getopt::Long;