[azure] [ci] Build on Windows using Dune.

We may want to keep the make-based and Dune job, however the
make-based setup is tested by the INRIA workers so it may not be
needed.

In order for some test to run well, we always run in Dune with an
absolute path. The easiest way to get a portable absolute path is to
use OCaml itself so we introduce a small executable to do that.

While we are at it, we do some cleanup of the test-suite `dune` file,
in particular we remove useless comments, set `--no-buffer` so results
can be seen in real time, and recognize the `NJOBS` variable as we
have moved to a Dune version that supports env vars.

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