klibc-utils: remove accidental "or later" licensing wording.

I (slightly) prefer my code to be under "GPLv2 only" license.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/klibc-utils/nuke.c b/klibc-utils/nuke.c
index a5d2f8d..6b65f70 100644
--- a/klibc-utils/nuke.c
+++ b/klibc-utils/nuke.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2017 Denys Vlasenko <vda.linux@googlemail.com>
  *
- * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
  */
 //config:config NUKE
 //config:	bool "nuke"