Revert accidental variant table commit

Author: mgorny

pyproject.toml

@@ -103,10 +103,3 @@ extras = ["test"]
 commands = [
     ["pytest"],
 ]
-
-[variant.default-priorities]
-namespace = ["x86_64"]
-
-[variant.providers.x86_64]
-plugin-api = "provider_variant_x86_64.plugin:X8664Plugin"
-requires = ["provider-variant-x86-64 >=0.0.1.post1"]