cast: downgrade license from LGPL3+ to LGPLv2.1+

[ccan] / ccan / cast / LICENSE

diff --git a/ccan/cast/LICENSE b/ccan/cast/LICENSE
index 74550445e70ed4a5f18c7ff0505d9e56d770fe52..dc314ecac02a0fb3117e54b1271ca135aaada572 120000 (symlink)
--- a/ccan/cast/LICENSE
+++ b/ccan/cast/LICENSE
@@ -1 +1 @@
-../../licenses/LGPL-3
\ No newline at end of file
+../../licenses/LGPL-2.1
\ No newline at end of file