chore: Re-enable layering_check now that rules_python supports it.

Author: iphydf

BUILD.bazel

@@ -1,8 +1,6 @@
 load("//third_party/python:build_defs.bzl", "pyx_library")
 load("//tools/project:build_defs.bzl", "project")
 
-package(features = ["layering_check"])
-
 project()
 
 genrule(
@@ -24,5 +22,6 @@ pyx_library(
     ],
     cdeps = ["//c-toxcore"],
     cython_directives = {"language_level": "3"},
+    tags = ["no-cross"],
     visibility = ["//visibility:public"],
 )

test/BUILD.bazel

@@ -4,5 +4,6 @@ load("@rules_python//python:defs.bzl", "py_test")
     name = src[:-3],
     size = "small",
     srcs = [src],
+    tags = ["no-cross"],
     deps = ["//py_toxcore_c:pytox"],
 ) for src in glob(["**/*.py"])]