sbuild: make environment passing work

sbuild filters the environment and removes all but a set of whitelisted
variables. Unfortunately, the filter is quite restrictive and filters
e.g. "TARGET", which can be used to configure a binutils build. There is
no good way to get around this environment filter from the command line.
The one way that does work, is passing a SBUILD_CONFIG that contains the
desired variables. Once we do have such a file, we can encode a number
of other command line switches as well.

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