Preserve flags ordering in Merlin configuration files. #11503
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Dune generated open flags for wrappers are passed last to the compiler, but they are preceding the user-defined flags in the generated Merlin configuration. This means that opens are not applied in the same order by the compiler and Merlin, leading to inconsistencies such as the one described in ocaml/merlin#1900
This PR restores the correct order.
Fixes ocaml/merlin#1900