[Patch, AArch64] Fix pointer assignment to param_block_t variables

[Yufeng Zhang]

Hi,

In the AArch64 libgloss backend, param_block_t is the base type for the 
Angle API block parameter and is defined as "long long".  Pointers are 
assigned to variables of this type via explicit casting, i.e. 
(param_block_t), which is OK when the pointer is 64-bit size but wrong 
when we have 32-bit pointers.

This patch replace the incorrect casting with a cpp macro which casts a 
pointer properly.

OK to go upstream?

Thanks,
Yufeng


libgloss/

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