endian: change license to CC0.

Not worth LGPL for just this header.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

ccan/endian/LICENSE

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

ccan/endian/_info

@@ -37,7 +37,7 @@
  *		exit(0);
  *	}
  *
- * License: LGPL (v2.1 or any later version)
+ * License: License: CC0 (Public domain)
  * Author: Rusty Russell <rusty@rustcorp.com.au>
  */
 int main(int argc, char *argv[])

ccan/endian/endian.h

-/* Licensed under LGPLv2.1+ - see LICENSE file for details */
+/* CC0 (Public domain) - see LICENSE file for details */
 #ifndef CCAN_ENDIAN_H
 #define CCAN_ENDIAN_H
 #include <stdint.h>