new 7.8 alpha

[Henrik Grubbstr�m (Lysator) @ Pike (-) developers forum]

> I’ve uploaded a new 7.8 alpha, incorporating the latest changes for
> bignum and clang. Please give it a spin. If I don’t hear anything
> I’ll promote it to beta and make an announcement on the main pike
> list.
>
> Pike-v7.8.852.tar.gz

Great! I've now updated the Gentoo Pike overlay accordingly.

        /grubba