* aarch64/syscalls.c (POINTER_TO_PARAM_BLOCK_T): New macro.
	(initialise_monitor_handles): Replace cast with macro
	POINTER_TO_PARAM_BLOCK_T.
	(_swiread): Likewise.
	(_swiwrite): Likewise.
	(_swiopen): Likewise.
	(_unlink): Likewise.
	(_system): Likewise.
	(_rename): Likewise.