[issue1551] games/rogue: fix strict-aliasing warning

[Ulrich Spoerlein (via DragonFly issue tracker)]

New submission from Ulrich Spoerlein <uqs at spoerlein.net>:

Fix broken aliasing for -O2 or higher
    
Fix taken from OpenBSD

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files: rogue.diff
messages: 7530
nosy: uqs
priority: cleanup
status: unread
title: games/rogue: fix strict-aliasing warning

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