typesafe_cb: relicense to CC0.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

ccan/typesafe_cb/LICENSE

-../../licenses/LGPL-2.1
+../../licenses/CC0
\ No newline at end of file

ccan/typesafe_cb/_info

@@ -135,7 +135,7 @@
  *		return 0;
  *	}
  *
- * License: LGPL (v2.1 or any later version)
+ * License: CC0 (Public domain)
  * Author: Rusty Russell <rusty@rustcorp.com.au>
  */
 int main(int argc, char *argv[])

ccan/typesafe_cb/typesafe_cb.h

-/* Licensed under LGPLv2.1+ - see LICENSE file for details */
+/* CC0 (Public domain) - see LICENSE file for details */
 #ifndef CCAN_TYPESAFE_CB_H
 #define CCAN_TYPESAFE_CB_H
 #include "config.h"