CMakeLists: Fix gstreamer version
CMakeLists: Fix gstreamer version

Change-Id: Ia33cdcfab88ee01a0304b450b8588a61bb4e17a0

Kurento/kms-core,ESTOS/kms-core,Kurento/kms-core,Kurento/kms-core,Kurento/kms-core,ESTOS/kms-core,ESTOS/kms-core,ESTOS/kms-core