Make slang headers available for vendor use
am: b1243c671a

Change-Id: I409f8fd25e1bdd582df72fd556367f2e147e4306
diff --git a/Android.bp b/Android.bp
index 8a394fa..c8fe151 100644
--- a/Android.bp
+++ b/Android.bp
@@ -69,6 +69,7 @@
 // Exported header files
 cc_library_headers {
     name: "slang_headers",
+    vendor_available: true,
     export_include_dirs: ["."],
     host_supported: true,
     target: {