Error message for missing link-location or location attribute

[tylerjw]

{
    "name": "Eigen3",
    "cps_version": "0.10.0",
    "version": "3.4.0",
    "components": {
        "default": {
            "type": "archive",
            "includes": {
                "c": [
                    "@prefix@/include/eigen3"
                ]
            }
        }
    },
    "default_components": [
        "default"
    ]
}