Descent-Rebirth and Descent II-Rebirth
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vLKp Remove explicit std::move in prepare_mission_menu_state return
clang warns that this interferes with copy elision.  The generated code
is slightly worse after following clang's advice and removing this, but
this is not a hot path, so take the hit to silence clang instead of
complicating the source.

Fixes: d97afc2 ("Retain directory structure in New Game dialog")
Latest commit 89b9561 Oct 20, 2018