Switch to API level 17 so that NoiseField can build.

Bug: 16031597
Change-Id: I207078fafdfce0300b4789ce685fa37bb88ca959
diff --git a/Android.mk b/Android.mk
index ecb8cde..158a43a 100644
--- a/Android.mk
+++ b/Android.mk
@@ -23,6 +23,7 @@
 
 LOCAL_PACKAGE_NAME := NoiseField
 LOCAL_CERTIFICATE := shared
+LOCAL_SDK_VERSION := 17
 
 LOCAL_PROGUARD_FLAG_FILES := proguard.cfg