Use abspath() instead of resolve() in expand._assert_local()

4249da1 uses `pathlib.Path.resolve()` instead of `os.path.abspath()`
to canonicalize path names. `resolve()` resolves symlinks, whereas
`abspath()` does not. `resolve()` can also raise a `RuntimeError` if
infinite loops are discovered while resolving the path. There is some
concern that using `resolve()` would not be backwards compatible. This
commit switches back to `abspath()` but still uses `Path.parents` to
avoid the edge case. See PR #3595 for more details.

setuptools/config/expand.py

@@ -151,9 +151,7 @@ def _read_file(filepath: Union[bytes, _Path]) -> str:
 
 
 def _assert_local(filepath: _Path, root_dir: str):
-    # NOTE: Path.resolve() will raise RuntimeError if an infinite loop is
-    # encountered along the resolution path of root_dir or file_path.
-    if Path(root_dir).resolve() not in Path(filepath).resolve().parents:
+    if Path(os.path.abspath(root_dir)) not in Path(os.path.abspath(filepath)).parents:
         msg = f"Cannot access {filepath!r} (or anything outside {root_dir!r})"
         raise DistutilsOptionError(msg)