binder: Don't include the compat symbols on arm64 binaries

... Since they're not the same when built at 64-bit, and the likelihood
of blobs requiring this are slim to none, just remove them

Change-Id: Ib4207055a9aadeb589a92b97a000f94cae270aa3
Merge pull request #3 from CyanogenMod/cm-12.0

binder: Don't include the compat symbols on arm64 binaries