[release/2.11] Pass extension sources as str, not pathlib.Path

[ethanwee1]

Why

get_ext_modules() builds the extension sources lists from _CSRC_DIR / "...", i.e. pathlib.Path objects. Older setuptools accepted os.PathLike, but newer setuptools/distutils now asserts that sources is a list of str:

File ".../tools/setup_helpers/extension.py", line 106, in get_ext_modules
    extension(
  ...
  File ".../setuptools/_distutils/extension.py", line 110, in __init__
    raise AssertionError("'sources' must be a list of strings")
AssertionError: 'sources' must be a list of strings

This breaks python setup.py bdist_wheel with a sufficiently new setuptools.

Fix

Wrap each source path in str() in the three extension(sources=...) lists. include_dirs are left unchanged (distutils does not assert on them).

[pytorch-bot]

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[ethanwee1]

Closing — for ROCm release/2.11 the fix will land in ROCm/audio (see ROCm#19) and the wheel pipeline's related_commits will point at ROCm/audio, not pytorch/audio.