Fix py311-test-osxclang-conda job

[pllim]

It failed horribly.

      clang-10 -bundle ... simple.cpython-311-darwin.so
      ld: warning: duplicate -rpath '/Users/runner/work/extension-helpers/extension-helpers/.tox/py311-test-osxclang-conda/lib' ignored
      ld: warning: duplicate -rpath '/Users/runner/work/extension-helpers/extension-helpers/.tox/py311-test-osxclang-conda/lib' ignored
      ld: warning: -pie being ignored. It is only used when linking a main executable
      ld: warning: duplicate -rpath '/Users/runner/work/extension-helpers/extension-helpers/.tox/py311-test-osxclang-conda/lib' ignored
      ld: warning: duplicate -rpath '/Users/runner/work/extension-helpers/extension-helpers/.tox/py311-test-osxclang-conda/lib' ignored
      ld: warning: -pie being ignored. It is only used when linking a main executable
      ld: tapi error: unsupported tapi file type '!tapi-tbd' in YAML in '/Applications/Xcode_15.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libSystem.B.tbd'
      clang-10: error: linker command failed with exit code 1 (use -v to see invocation)
      error: command '/Users/runner/work/extension-helpers/extension-helpers/.tox/py311-test-osxclang-conda/bin/clang-10' failed with exit code 1
      [end of output]
...
ERROR: Failed to build installable wheels for some pyproject.toml based projects (helpers_test_package_6ad69b45_fd12_420e_876d_ed99f14716ec)