Make libapf compile against the NDK. am: 6ef6218a98 am: 991babe7e3 am: 9d9e852f62

Change-Id: I07e0c627a037913367035218d4a4746b0e57f92f
diff --git a/Android.bp b/Android.bp
index 4157e2a..9c9870c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -20,7 +20,7 @@
     name: "libapf",
     defaults: ["apf_defaults"],
     srcs: ["apf_interpreter.c"],
-
+    sdk_version: "24",
 }
 
 cc_binary_host {