ota: Disable downgrade check

We want users to be able to downgrade their packages.

Change-Id: I6bcbd4ee2a02640fe0855b0f1f197a02e914c927
core: main: remove all the spam about including make files

to disable showing the makefile includes:

	export HIDE_MAKEFILE_INCLUDES=y

Change-Id: Ifd2ef0e239d16b169c572472416c2c31df62a367
installclean: remove *.md5sum

Change-Id: Iba47421324bd6bbeabaa80eb66daf6a25621d6a2
unpackbootimg: add a target specifically for unpackbootimg

Change-Id: I8c71a56505d155f43d0776074c09404ce6f6d34b
build: Add unpackbootimg to dist_tools

Change-Id: I58622b8f0a85db18fabdc2cf96d11c5982a9c9d8