{
    "tests" : [
        {
            "filename" : "main.cpp"
        }
    ]
}

{
    "minimum_clang_version" : 370,
    "tests" : [
        {
            "filename" : "main.cpp"
        }
    ]
}

Set minimum clang version to 3.7 for unit-tests
qenums: Set minimum clang version to 3.7 for unit-tests

So it doesn't run on 3.6, which doesn't have PPCallbacks
