Add METADATA to libunwind: MIT+Apache2=NOTICE am: 96a62d4598

Change-Id: I3fe419ab99173bcd76b2596906b21f4ebb868099
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..d97975c
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,3 @@
+third_party {
+  license_type: NOTICE
+}