array_size: relicense under public domain.

It's just a header, I don't care what's done with it.

ccan/array_size/LICENSE

@@ -1 +0,0 @@
-../../licenses/LGPL-2.1

ccan/array_size/_info

@@ -29,7 +29,7 @@
  *		return 0;
  *	}
  *
- * License: LGPL (v2.1 or any later version)
+ * License: Public domain
  * Author: Rusty Russell <rusty@rustcorp.com.au>
  */
 int main(int argc, char *argv[])

ccan/array_size/array_size.h

@@ -1,4 +1,3 @@
-/* Licensed under LGPLv2.1+ - see LICENSE file for details */
 #ifndef CCAN_ARRAY_SIZE_H
 #define CCAN_ARRAY_SIZE_H
 #include "config.h"