[Lazarus] Aarch64 as CPU target for RPi3 with Linux as OS

[Alfred]

FYI.

All my RPi(2) FPC/Lazarus apps do run unchanged on the new RPi3, by just 
replacing the boot firmware with the latest firmware.

They were (cross-)compiled for ARMV7 hardfloat and run on Arch Linux.

And .... boot is fast ... and ... my apps run FAST !!!
So, this makes the change towards the new RPi3 hardware a very easy one, 
at least for 32 bit apps.

Now we wait for 64 bit ... ;-)