fix: force canonical name for builtin std module name

[cerisier]

This is a small one but required to build Zig with rules_zig instead since we have to do a zig_library for std.
There is a hardcoded rule in the handling of --dep in zig that doesn't allow doing anything else but --dep=std=std.

https://codeberg.org/ziglang/zig/src/commit/5cc281e7232b9f1bc5f4d732e4a37fb5df02f780/src/main.zig#L1091-L1097

[aherrmann]

Is ctx.label.name == "std" the right condition? Shouldn't this trigger on ctx.attr.import_name == "std"? Otherwise this would falsely trigger on the following:

# //foo:BUILD.bazel
zig_library(
    name = "std",
    import_name = "foo_std",
    ...
)

[cerisier]

Indeed ! I'll check import_name if it's not None and fallback on name.

[cerisier]

Amended

[aherrmann]

Thank you!