To support llorg builds this patch provides the following changes:
- Added cmake variable ITTAPI_GIT_REPOSITORY to control the location of ITTAPI repository. Default value of ITTAPI_GIT_REPOSITORY is github location: https://github.com/intel/ittapi.git Also, the separate cmake variable ITTAPI_GIT_TAG was added for repo tag.
- Added cmake variable ITTAPI_SOURCE_DIR to control the place where the repo will be cloned. Default value of ITTAPI_SOURCE_DIR is build area: PROJECT_BINARY_DIR