[PATCH, AArch64] Define ssize_t as long

[Yufeng Zhang]

Hi,

The attached patch adds to the AArch64 port a machine specific _types.h 
file to define _ssize_t as long (instead of int by default).  With this 
patch, ssize_t will have the same size as the type size_t on AArch64.

Is it OK?

Thanks,
Yufeng

newlib/

2012-12-13  Yufeng Zhang  <yufeng.zhang@arm.com>

         * libc/machine/aarch64/machine/_types.h: New file; define _ssize_t
         as long.
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