Mark libdemangle as vendor_available.

This means the library may be installed in both the
/system and /vendor partitions, if they are used by
system and vendor code respectively.

Test: mm -j64
Bug: 38244611
Change-Id: I5874529d410a226c028a248b0d22ea5e80639445
Merged-In: I978f8e34d354e4fe03a3c19dd0dbc6899f26a793
diff --git a/demangle/Android.bp b/demangle/Android.bp
index 96ab57d..ce617a7 100644
--- a/demangle/Android.bp
+++ b/demangle/Android.bp
@@ -28,6 +28,9 @@
 
 cc_library {
     name: "libdemangle",
+
+    vendor_available: true,
+
     defaults: ["libdemangle_defaults"],
 
     srcs: [