comparing md5sums of:

android-header's /usr/include/android/hardware 
vs 
https://android.googlesource.com/platform/hardware/libhardware/+/android-4.2.2_r1.1

audio_effect.h: OK
audio.h: FAILED
audio_policy.h: OK
bluetooth.h: OK
bt_av.h: OK
bt_hf.h: OK
bt_hh.h: OK
bt_hl.h: OK
bt_pan.h: OK
bt_sock.h: OK
camera2.h: OK
camera_common.h: OK
camera.h: FAILED
fb.h: OK
gps.h: OK
gralloc.h: FAILED
hardware.h: FAILED
hwcomposer_defs.h: FAILED
hwcomposer.h: OK
hwcomposer_v0.h: OK
keymaster.h: OK
lights.h: FAILED
local_time_hal.h: OK
nfc.h: OK
power.h: FAILED
qemud.h: OK
qemu_pipe.h: OK
sensors.h: OK
md5sum: WARNING: 7 computed checksums did NOT match