cjson: update LICENSE hash for 1.7.0

No change to the contents but indentation.

Fixes:
http://autobuild.buildroot.net/results/626/626f01bb2e769914d471e70665f7f2909e1f5fe2/



Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>