Minimal manifest to build ART for target

yeah mini

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1. sudo apt-get install make python-is-python2 lib32z1
2. Install oracle jdk 1.6 and export ANDROID_JAVA_HOME=/path/to/the/jdk && export PATH=$PATH:$ANDROID_JAVA_HOME/bin
3. source build/envsetup.sh && lunch && m build-art-target