Bug#757008: critterding: segfaults on amd64, NV98

[Gabriele Giacone]

Few tests, attached screenshots.

Current crittering version in testing - beta12.1:

    NV46_1.0-beta12.1-1.2_nouveau.png
        Some glitches with nouveau driver.

    NV46_1.0-beta12.1-1.2_nvidia.png
        No glitches by switching to non-free nvidia driver.

New upstream version - beta14:

    As said, it segfaults with nouveau driver and both NV46 and NV98 cards.
    By switching to non-free nvidia driver, it doesn't segfault anymore.

    NV46_1.0-beta14+dfsg-1_nvidia.png
        Dramatically slow, see top-left ~1 FPS.
        Usable by passing "--glsl 0".

    NV98_1.0-beta14+dfsg-1_nvidia.png
        Usable.
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