For reference extension builds, update book_path to reference the appropriate file location.
For reference extension builds, update book_path to reference the appropriate file location.

Change-Id: I1eab8fcde8348e7cd7efa90c5c1768b1103e5b97

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build