Remove unused imports

Tools/clinic/libclinic/codegen.py

@@ -2,17 +2,15 @@
 import dataclasses as dc
 import io
 import os
-from collections.abc import Callable
 from typing import Final, TYPE_CHECKING
 if TYPE_CHECKING:
     from clinic import Clinic
 
 import libclinic
 from libclinic import fail
 from libclinic.crenderdata import Include
-from libclinic.language import Language, PythonLanguage
+from libclinic.language import Language
 from libclinic.block_parser import Block
-from libclinic.lang_c import CLanguage
 
 
 @dc.dataclass(slots=True)