Add METADATA to dlmalloc: CC0+PublicDomain=UNENCUMBERED am: e23e758a2b am: 86a59f3d28 am: a58c8569d5 am: 95521523bd am: 3565acb4b9

Change-Id: Iee8da9cd0a8da99fec0b5f602de7f256321e04ce
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..313792c
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,3 @@
+third_party {
+  license_type: UNENCUMBERED
+}