addOptionalResolvedTarget

fn addOptionalResolvedTarget(
    wc: *Configuration.Wip,
    optional_resolved_target: ?std.Build.ResolvedTarget,
) !Configuration.ResolvedTarget.OptionalIndex {
    const resolved_target = optional_resolved_target orelse return .none;
    return .init(try wc.addDeduped(Configuration.ResolvedTarget, .{
        .query = try wc.addTargetQuery(&resolved_target.query),
        .result = try wc.addTarget(resolved_target.result),
    }));
}