str: relicense to public domain.

LGPL is overkill for trivial wrappers like this.

ccan/str/LICENSE

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

ccan/str/_info

@@ -35,7 +35,7 @@
  *		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/str/debug.c

-/* Licensed under LGPLv2.1+ - see LICENSE file for details */
 #include "config.h"
 #include <ccan/str/str_debug.h>
 #include <assert.h>

ccan/str/str.c

-/* Licensed under LGPLv2.1+ - see LICENSE file for details */
 #include <ccan/str/str.h>
 
 size_t strcount(const char *haystack, const char *needle)

ccan/str/str.h

-/* Licensed under LGPLv2.1+ - see LICENSE file for details */
+/* Placed into the public domain. */
 #ifndef CCAN_STR_H
 #define CCAN_STR_H
 #include "config.h"

ccan/str/str_debug.h

-/* Licensed under LGPLv2.1+ - see LICENSE file for details */
 #ifndef CCAN_STR_DEBUG_H
 #define CCAN_STR_DEBUG_H