Don't build libmediandk for PDK

Change-Id: I9b2e5f5c8cc0fad59d4a4268c8767f540d536d10
diff --git a/media/ndk/Android.mk b/media/ndk/Android.mk
index 0ea0c3f..82fb970 100644
--- a/media/ndk/Android.mk
+++ b/media/ndk/Android.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2010 The Android Open Source Project
+# Copyright (C) 2014 The Android Open Source Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,6 +16,8 @@
 
 LOCAL_PATH:= $(call my-dir)
 
+ifneq ($(TARGET_BUILD_PDK), true)
+
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES:=                                       \
@@ -39,3 +41,5 @@
     libandroid_runtime \
 
 include $(BUILD_SHARED_LIBRARY)
+
+endif