strmap: Set the license for strmap to CC0

[ccan] / ccan / strmap / LICENSE

diff --git a/ccan/strmap/LICENSE b/ccan/strmap/LICENSE
new file mode 120000 (symlink)
index 0000000..b7951da
--- /dev/null
+++ b/ccan/strmap/LICENSE
@@ -0,0 +1 @@
+../../licenses/CC0
\ No newline at end of file