python310Packages.mypy: ignore broken test on i686

The tests in question rely on specific floating point accuracy and break
on Hydra on i686-linux. The test disabling pattern is maybe overly
broad, but I couldn't find a better one to cover the three broken
checks.

pkgs/development/python-modules/mypy/default.nix

@@ -119,6 +119,9 @@ buildPythonPackage rec {
     "mypyc/test/test_commandline.py"
     # fails to find hatchling
     "mypy/test/testpep561.py"
+  ] ++ lib.optionals stdenv.hostPlatform.isi686 [
+    # https://github.com/python/mypy/issues/15221
+    "mypyc/test/test_run.py"
   ];
 
   meta = with lib; {