Remove img lib dependencies in cimg
Remove img lib dependencies in cimg

Change-Id: Ib81968699f05e2eadd7dc0b98337a81d1e97b7cd

zhanshenman/TheiaSfM,zhanshenman/TheiaSfM,zhanshenman/TheiaSfM,zhanshenman/TheiaSfM,zhanshenman/TheiaSfM