Fix stdlib/disutils testing (#9734)

stdlib/distutils/cygwinccompiler.pyi

@@ -1,4 +1,20 @@
 from distutils.unixccompiler import UnixCCompiler
+from distutils.version import LooseVersion
+from re import Pattern
+from typing_extensions import Literal
+
+def get_msvcr() -> list[str] | None: ...
 
 class CygwinCCompiler(UnixCCompiler): ...
 class Mingw32CCompiler(CygwinCCompiler): ...
+
+CONFIG_H_OK: str
+CONFIG_H_NOTOK: str
+CONFIG_H_UNCERTAIN: str
+
+def check_config_h() -> tuple[Literal["ok", "not ok", "uncertain"], str]: ...
+
+RE_VERSION: Pattern[bytes]
+
+def get_versions() -> tuple[LooseVersion | None, ...]: ...
+def is_cygwingcc() -> bool: ...