Fix typo
Fix typo

This was producing a number of unused source warnings for prebuilt files
using LOCAL_SRC_FILES_<arch>.

Change-Id: I48d1face7baf642f3ef17f957448ccb73788765f

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