made 3 license strings to follow the usual form ("or later" bit is not changed!)

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
diff --git a/archival/dpkg.c b/archival/dpkg.c
index 219512b..b36c261 100644
--- a/archival/dpkg.c
+++ b/archival/dpkg.c
@@ -12,7 +12,7 @@
  *
  *  started life as a busybox implementation of udpkg
  *
- * 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.
  */
 
 /*