commit 76bc19e2e55023ea5a17c212eab0e1e5db217315
Author: Dino Bollinger <dino.bollinger@gmail.com>
Date:   Sun Jun 27 20:44:44 2021 +0200

    Prevent negative bases for powf in videoSetGamma()
    
    Otherwise causes NaN results. Not sure if this algorithm is even doing
    what it's supposed to do, but this makes the color correction somewhat
    functional again.

See https://voidpoint.io/terminx/eduke32 for more details.