Stamp platform version code into app Apks

The versionCode of theframework resources that an app is built against
gets stamped inside an app's AndroidManifest.xml in the <manifest>
tag as "platformBuildVersionCode" and "platformBuildVersionName"
attributes.

Bug:17207635
Change-Id: Id573c3dffcbca38eec9c0eb3e89f4a547e3361d3
diff --git a/tools/aapt/Android.mk b/tools/aapt/Android.mk
index 4ce5045..2cbabe1 100644
--- a/tools/aapt/Android.mk
+++ b/tools/aapt/Android.mk
@@ -28,6 +28,7 @@
     AaptAssets.cpp \
     AaptConfig.cpp \
     AaptUtil.cpp \
+    AaptXml.cpp \
     ApkBuilder.cpp \
     Command.cpp \
     CrunchCache.cpp \