Drop stubs for CheckedCall and added is_available

Author: Xiddoc

stubs/pyperclip/pyperclip/__init__.pyi

@@ -1,7 +1,7 @@
 __all__ = ["copy", "paste", "set_clipboard", "determine_clipboard"]
 
 from collections.abc import Callable
-from typing import Any, Literal, Protocol
+from typing import Literal
 from typing_extensions import TypeAlias
 
 class PyperclipException(RuntimeError): ...
@@ -11,15 +11,6 @@ class PyperclipWindowsException(PyperclipException):
 
 class PyperclipTimeoutException(PyperclipException): ...
 
-class _WinDLLUser32Function(Protocol):
-    def __call__(self, *args: Any) -> Any: ...
-
-# Wrapper for ctypes calls, should not be exposed to the developer
-class CheckedCall:
-    def __init__(self, f: _WinDLLUser32Function) -> None: ...
-    def __call__(self, *args: Any) -> Any: ...
-    def __setattr__(self, key: str, value: Any) -> None: ...
-
 _ClipboardMechanismName: TypeAlias = Literal[
     "pbcopy", "pyobjc", "qt", "xclip", "xsel", "wl-clipboard", "klipper", "windows", "no"
 ]
@@ -30,3 +21,4 @@ def copy(text: str) -> None: ...
 def paste() -> str: ...
 def set_clipboard(clipboard: _ClipboardMechanismName) -> None: ...
 def determine_clipboard() -> tuple[_ClipboardCopyMechanism, _ClipboardPasteMechanism]: ...
+def is_available() -> bool: ...