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pkg: don't use "compiler" flag to identify compiler (#10521)

Opam's "compiler" flag is used too broadly to accurately identify
packages containing ocaml compilers. For example this flag is set for
compiler options packages such as ocaml-option-flambda which configure
the ocaml-variants package, effectively preventing the use of compiler
options packages, as ocaml-variants also has the "compiler" flag set,
and dune only permits a single compiler package in a solution.

This change fixes this problem by using the presence of the
"ocaml-core-compiler" conflict class to identify compiler
packages.

Signed-off-by: Stephen Sherratt <stephen@sherra.tt>

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