test setup: avoid _specification, ignored by dune
#202
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I found that the test dependency on
_specificationdid not work, and debugged this a bit. Turns out thatdunegenerally ignores files whose name begins with_:ocaml/dune#4795
But I also found out that
dunetracks dependencies to files outside the project root fine through a symbolic link.So this PR replaces the
Makefile-generated_specificationcopy with aspecification → ../specificationsymlink. This simplifies makefiles and removes moving parts.