library cleanup to suppress warnings on cmake 3.0
only set the policy if it exists
remove some extra spaces
fix reference to INCLUDE_QT variable in SetupHifiProject macro
Merge branch 'oculus'
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge pull request #3225 from birarda/master

cmake file cleanup to suppress warnings on cmake 3.0