In practice, all of the .cxx of that library (except for a handful of newly
introduced ones that had failed to follow the cargo cult) undefined it first
thing before including anything else, anyway.  IIRC, this was a quirk with the
old build system, that had dutifully been carried across.

Change-Id: I7642c21af48e15b14f245bbbf3d38fdd365c3c89