Makefile: get rid of CWM recovery stuff

Change-Id: I8fc553996d703d48f0c48b363d4366d3a11ce787
Signed-off-by: Evan Anderson <evan1124@gmail.com>
Allow cache img to be disabled

Change-Id: Idbd83f449c0a3265ee9c35b60528a4d1c237c28a
Enable incremental builder to find files that moved, and
try to process them via patch + rename, instead of
delete + add.

b/11437930

Change-Id: Ie70632a2fa0a13d4bb259f61c620bb01812494e5

Conflicts:
	tools/releasetools/ota_from_target_files