cmake YARP_HAS_ examples

robotology/yarp cmake/YarpFindDependencies.cmake :217 

elseif(NOT YARP_HAS_${package} AND DEFINED YARP_BUILD_DEPS_${package} AND NOT YARP_BUILD_DEPS_${package})

robotology/yarp cmake/YarpFindDependencies.cmake :220 

elseif(NOT YARP_HAS_${package})

robotology/yarp cmake/YarpFindDependencies.cmake :224 

else(NOT YARP_HAS_${package})