[Mach-O, committed]: Add definition for arm64 cpu

[Richard Earnshaw]

On 26/03/14 16:43, Marcus Shawcroft wrote:
> On 26 March 2014 16:34, Tristan Gingold <gingold@adacore.com> wrote:
> 
>> In fact it is consistent with the macro name defined by Apple :-(
>> Hard to be consistent with two non-consistent usages.
> 
> That justification does not hold for the name string in bfd_mach_o_cpu_name[].
> 
> /Marcus
> 

Nor does it hold for the internal names, eg BFD_MACH_O_CPU_TYPE_ARM64

R.