added library entropy to cmake
added library entropy to cmake

jewmanchue/wham,chapmanb/wham,jewmanchue/wham,jewmanchue/wham,zeeev/wham,Yandell-Lab/wham,Yandell-Lab/wham,chapmanb/wham,zeeev/wham,chapmanb/wham,zeeev/wham,Yandell-Lab/wham,chapmanb/wham,jewmanchue/wham,zeeev/wham,Yandell-Lab/wham