*: make GNU licensing statement forms more regular

This change retains "or later" state! No licensing _changes_ here,
only form is adjusted (article, space between "GPL" and "v2" and so on).

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

init/Kbuild.src

@@ -2,7 +2,7 @@
 #
 # Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
 #
-# Licensed under the GPL v2, see the file LICENSE in this tarball.
+# Licensed under GPLv2, see file LICENSE in this source tree.
 
 lib-y:=
 

init/bootchartd.c

@@ -1,6 +1,6 @@
 /* vi: set sw=4 ts=4: */
 /*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
 //config:config BOOTCHARTD

init/halt.c

@@ -4,7 +4,7 @@
  *
  * Copyright 2006 by Rob Landley <rob@landley.net>
  *
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
  */
 
 #include "libbb.h"

init/init.c

@@ -6,7 +6,7 @@
  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  * Adjusted by so many folks, it's impossible to keep track.
  *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
 #include "libbb.h"

init/mesg.c

@@ -4,7 +4,7 @@
  *
  * Copyright (c) 2002 Manuel Novoa III  <mjn3@codepoet.org>
  *
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
 #include "libbb.h"