Specify required argument types for FFI functions

On arm64 macOS, variadic arguments have special calling convention rules.
Therefore, we must specify the required argument types for ctypes to 
pass the arguments correctly.

Apple documentation: https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms#Update-Code-that-Passes-Arguments-to-Variadic-Functions

Fix issue #8046

discord/opus.py

@@ -142,7 +142,7 @@ def _err_ne(result: T, func: Callable, args: List) -> T:
 # The fourth is the error handler.
 exported_functions: List[Tuple[Any, ...]] = [
     # Generic
-    ('opus_get_version_string', None, ctypes.c_char_p, None),
+    ('opus_get_version_string', [], ctypes.c_char_p, None),
     ('opus_strerror', [ctypes.c_int], ctypes.c_char_p, None),
     # Encoder functions
     ('opus_encoder_get_size', [ctypes.c_int], ctypes.c_int, None),
@@ -154,7 +154,7 @@ exported_functions: List[Tuple[Any, ...]] = [
         ctypes.c_int32,
         _err_lt,
     ),
-    ('opus_encoder_ctl', None, ctypes.c_int32, _err_lt),
+    ('opus_encoder_ctl', [EncoderStructPtr, ctypes.c_int], ctypes.c_int32, _err_lt),
     ('opus_encoder_destroy', [EncoderStructPtr], None, None),
     # Decoder functions
     ('opus_decoder_get_size', [ctypes.c_int], ctypes.c_int, None),
@@ -171,7 +171,7 @@ exported_functions: List[Tuple[Any, ...]] = [
         ctypes.c_int,
         _err_lt,
     ),
-    ('opus_decoder_ctl', None, ctypes.c_int32, _err_lt),
+    ('opus_decoder_ctl', [DecoderStructPtr, ctypes.c_int], ctypes.c_int32, _err_lt),
     ('opus_decoder_destroy', [DecoderStructPtr], None, None),
     ('opus_decoder_get_nb_samples', [DecoderStructPtr, ctypes.c_char_p, ctypes.c_int32], ctypes.c_int, _err_lt),
     # Packet functions