bufhl: fix unittests and lint

msgpack_rpc_dispatch doesn't exist anymore

src/nvim/msgpack_rpc/defs.h

@@ -1,8 +1,6 @@
 #ifndef NVIM_MSGPACK_RPC_DEFS_H
 #define NVIM_MSGPACK_RPC_DEFS_H
 
-#include <msgpack.h>
-
 
 /// The rpc_method_handlers table, used in msgpack_rpc_dispatch(), stores
 /// functions of this type.
@@ -24,22 +22,6 @@ void msgpack_rpc_add_method_handler(String method,
 
 void msgpack_rpc_init_function_metadata(Dictionary *metadata);
 
-/// Dispatches to the actual API function after basic payload validation by
-/// `msgpack_rpc_call`. It is responsible for validating/converting arguments
-/// to C types, and converting the return value back to msgpack types.
-/// The implementation is generated at compile time with metadata extracted
-/// from the api/*.h headers,
-///
-/// @param channel_id The channel id
-/// @param method_id The method id
-/// @param req The parsed request object
-/// @param error Pointer to error structure
-/// @return Some object
-Object msgpack_rpc_dispatch(uint64_t channel_id,
-                            msgpack_object *req,
-                            Error *error)
-  FUNC_ATTR_NONNULL_ARG(2) FUNC_ATTR_NONNULL_ARG(3);
-
 MsgpackRpcRequestHandler msgpack_rpc_get_handler_for(const char *name,
                                                      size_t name_len)
   FUNC_ATTR_NONNULL_ARG(1);