Conditionally Revert "put back the unused virtuals in Vector<>"

These symbols are needed for MR2 camera.tegra and other blobs,
but they conflict with KK blobs so define it for devices that
need it by setting COMMON_GLOBAL_CFLAGS += -DNEEDS_VECTORIMPL_SYMBOLS

Change-Id: I59e66074526f013918a29c3afc10e52b9812778c
Merge "Conditionally Revert "put back the unused virtuals in Vector<>"" into android-4.4
Merge remote-tracking branch 'cm/android-4.4' into android-4.4