Test runner integration not working

[dweiller]

Current master versions of the Zig compiler do not compile benchmarks using the test runner integration. The upstream issue whose resolution should allow using the test runner to work again is ziglang/zig#13970.

[dweiller]

That issue is now resolved, and the test runner integration can now be used by importing the build.zig. In order for a nice UX with the package manager, ziglang/zig#14587 or an equivalent will need to be merged.