Revert "Extractor: use filesystem-canonical path comparison to determine built-in files"

This reverts commit 01cf7e9.

Author: d10c

python/extractor/semmle/extractors/builtin_extractor.py

@@ -1,6 +1,4 @@
 import sys
-import os
-from pathlib import Path
 from semmle import util
 from semmle.python.passes.objects import ObjectPass
 from semmle.extractors.base import BaseExtractor
@@ -19,7 +17,7 @@ def process(self, unit):
         # Modules in the standard library (e.g. `os`)
         if not self.options.extract_stdlib and \
             isinstance(unit, util.FileExtractable) and \
-            _is_subpath(unit.path, util.STDLIB_PATH):
+            unit.path.startswith(util.STDLIB_PATH):
                 return SkippedBuiltin
         if not isinstance(unit, util.BuiltinModuleExtractable):
             return NotImplemented
@@ -41,18 +39,3 @@ def process(self, unit):
 
     def close(self):
         pass
-
-def _is_subpath(path, prefix):
-    # Prefer filesystem-canonical comparison when possible
-    try:
-        p = Path(path).resolve()
-        q = Path(prefix).resolve()
-        return p == q or q in p.parents
-    except OSError:
-        # Fallback for non-existent paths: normalize and compare strings
-        p_str = os.path.normcase(os.path.normpath(os.path.abspath(path)))
-        q_str = os.path.normcase(os.path.normpath(os.path.abspath(prefix)))
-        # Ensure prefix is a directory boundary
-        if not q_str.endswith(os.path.sep):
-            q_str = q_str + os.path.sep
-        return p_str == q_str.rstrip(os.path.sep) or p_str.startswith(q_str)