crowddetector: Add math library dependency
crowddetector: Add math library dependency

Change-Id: Iadd1a163f09f981b5299dfdde5f5246cedc80445

shelsonjava/kms-crowddetector,shelsonjava/kms-crowddetector,dfernandezlop/kms-crowddetector,dfernandezlop/kms-crowddetector,Kurento/kms-crowddetector,shelsonjava/kms-crowddetector,Kurento/kms-crowddetector,dfernandezlop/kms-crowddetector,Kurento/kms-crowddetector