setuptools: add various missing objects and annotations

stubs/setuptools/setuptools/_distutils/ccompiler.pyi

@@ -1,5 +1,5 @@
 from collections.abc import Callable
-from typing import Any
+from typing import Any, ClassVar
 from typing_extensions import TypeAlias
 
 _Macro: TypeAlias = tuple[str] | tuple[str, str | None]
@@ -15,6 +15,15 @@ def new_compiler(
 def show_compilers() -> None: ...
 
 class CCompiler:
+    src_extensions: ClassVar[list[str] | None]
+    obj_extensions: ClassVar[str | None]
+    static_lib_extension: ClassVar[str | None]
+    shared_lib_extension: ClassVar[str | None]
+    static_lib_format: ClassVar[str | None]
+    shared_lib_format: ClassVar[str | None]
+    exe_extension: ClassVar[str | None]
+    language_map: ClassVar[dict[str, str]]
+    language_order: ClassVar[list[str]]
     dry_run: bool
     force: bool
     verbose: bool

stubs/setuptools/setuptools/_distutils/cmd.pyi

@@ -10,6 +10,7 @@ class Command:
     distribution: Distribution
     sub_commands: ClassVar[list[tuple[str, Callable[[Self], bool] | None]]]
     def __init__(self, dist: Distribution) -> None: ...
+    def ensure_finalized(self) -> None: ...
     @abstractmethod
     def initialize_options(self) -> None: ...
     @abstractmethod

stubs/setuptools/setuptools/_distutils/command/build_ext.pyi

@@ -1,6 +1,7 @@
 from _typeshed import Incomplete
 
 from ..cmd import Command
+from ..extension import Extension
 
 class build_ext(Command):
     description: str
@@ -42,5 +43,5 @@ class build_ext(Command):
     def get_ext_fullpath(self, ext_name: str) -> str: ...
     def get_ext_fullname(self, ext_name: str) -> str: ...
     def get_ext_filename(self, ext_name: str) -> str: ...
-    def get_export_symbols(self, ext): ...
-    def get_libraries(self, ext): ...
+    def get_export_symbols(self, ext: Extension) -> list[str]: ...
+    def get_libraries(self, ext: Extension) -> list[str]: ...

stubs/setuptools/setuptools/logging.pyi

@@ -1,2 +1,2 @@
 def configure() -> None: ...
-def set_threshold(level): ...
+def set_threshold(level: int) -> int: ...