opt: relicense to GPLv2+ (from GPLv3+)

[ccan] / ccan / opt / LICENSE

diff --git a/ccan/opt/LICENSE b/ccan/opt/LICENSE
index 190cfd5ed15e145962c5847eb3477c4f13805268..9961ca9d9cffb40daa53a8a43ceb8e4b68c267aa 120000 (symlink)
--- a/ccan/opt/LICENSE
+++ b/ccan/opt/LICENSE
@@ -1 +1 @@
-../../licenses/GPL-3
\ No newline at end of file
+../../licenses/GPL-2
\ No newline at end of file