Update to work with zig 0.17.0-dev.284+cd23f7a81

[ezzieyguywuf]

No description provided.

[ezzieyguywuf]

@Srekel as discussed in #35 here is the follow-up PR

[Srekel]

Hi, the automated test didn't work. Not sure if it's because it's running Zig 0.15.1...?

src/zflecs.zig:34:12: error: invalid builtin function: '@Int'
    return @Int(.unsigned, bits);
           ^~~~~~~~~~~~~~~~~~~~~