[perl #45957] [TODO] Implement mmd_is_hidden()

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# New Ticket Created by  Paul Cochrane 
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In src/mmd.c there is the todo item essentially asking that mmd_is_hidden()
be implemented:

    /*
     * if the candidate list already has the a sub with the same
     * signature (long name), the outer multi is hidden
     *
     * TODO
     */