*: 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>
diff --git a/debianutils/run_parts.c b/debianutils/run_parts.c
index ba05897..b93a5a9 100644
--- a/debianutils/run_parts.c
+++ b/debianutils/run_parts.c
@@ -12,7 +12,7 @@
  *   Copyright (C) 1996-1999 Guy Maor <maor@debian.org>
  *
  *
- * Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
 /* This is my first attempt to write a program in C (well, this is my first