Clarify license string.

ccan/crc/_info.c

@@ -25,7 +25,7 @@
  *		exit(0);
  *	}
  *
- * Licence: GPL (v2 or later)
+ * Licence: GPL (v2 or any later version)
  * Author: Gary S. Brown, Clay Haapala
  * Maintainer: Rusty Russell <rusty@rustcorp.com.au>
  */