[PATCH][AArch64] change greg_t definition in ucontext.h

[Szabolcs Nagy]

This change assumes greg_t is not used outside of libc.
In glibc it is usually used for defining gregset_t, but
on aarch64 elf_greg_t is used for that, greg_t is not
used anywhere (so it is meant to be a cosmetic fix).

If greg_t is used outside of libc, then this is an ABI
change, but

typedef int greg_t;

is not a useful definition on aarch64.

Some targets (powerpc) don't define greg_t at all so
removing it should be a valid fix too. It seems the
signedness of greg_t varies between targets so i settled
for using elf_greg_t (unsigned long) for the typedef to
be consistent with the members of gregset_t.


Changelog:

2015-05-07  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h (greg_t): Change the
	definition to elf_greg_t.
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