Tests: Add a --use-core --impl-debug case

This demonstrates the [...] abbreviation of large arrays in contrast to
the std variety. (Long (>32) arrays currently don't have a dedicated
test, but are piggy-backed on the derive-debug-bitfield and
derive-debug-function-pointer tests).

Note that the single occurrence of the `std` namespace in the
expectation is valid: No --ctypes-prefix was set, and ::std::os::raw is
the default value that needs to be overridden in most practical
--use-core applications.

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