In case a package/image requres specific host dependencies it is
possible to define entries in the `host_dependencies` array. Each entry
is an object containing at least `name` and `which`. The `which` array
contains tools to be checked in the current `PATH`.
Optionally the two options `success_diffconfig` and
`fallback_diffconfig` can be set. The former is optionally added in case
the tool is found. The latter is added if the dependency is not
available.
If the dependecy is not available and no `fallback_diffconfig` is set,
the config generation is considered impossible and stopped.
Signed-off-by: Paul Spooren <mail@aparcar.org>
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