fix(visitor): replace abspath with normpath to correct logics

Author: wu-vincent

src/dwarf2cpp/visitor.py

@@ -266,7 +266,7 @@ def visit_namespace(self, die: DWARFDie) -> None:
                 if not decl_file:
                     continue
 
-                decl_file = posixpath.abspath(decl_file.replace("\\", "/"))
+                decl_file = posixpath.normpath(decl_file.replace("\\", "/"))
                 if not decl_file.startswith(self._base_dir):
                     continue