libsystem_headers: export libaudio_system_headers
am: c83ea95654

Change-Id: Ifc63b3b88ed7330db99dc712d2dc590d71440a50
diff --git a/libsystem/Android.bp b/libsystem/Android.bp
index 846a585..e92fe63 100644
--- a/libsystem/Android.bp
+++ b/libsystem/Android.bp
@@ -2,6 +2,10 @@
     name: "libsystem_headers",
     vendor_available: true,
     host_supported: true,
+
+    header_libs: ["libaudio_system_headers"],
+    export_header_lib_headers: ["libaudio_system_headers"],
+
     export_include_dirs: ["include"],
 
     target: {