cryptsetup: bump to version 2.0.0

Add the now mandatory json-c depencecy. Propagate to reverse
dependencies.

Drop the no longer needed patch.

Add license files hashes.

[Peter: propagate _HAS_SYNC_4 dependency to comments as pointed out by
	Thomas]
Cc: Martin Hicks <mort@bork.org>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>