Basic AArch64 (aka arm64) detection.

Patch by Marcin Juszkiewicz <marcin@juszkiewicz.com.pl>
licensed under either Public Domain or BSD:

<https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=735488#179>

Change-Id: I9f415cb6ac6c4ff78588d96e36198c85ee202d96
Reviewed-by: Marcin Juszkiewicz <marcin@juszkiewicz.com.pl>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Use QCOMPARE instead of QVERIFY where applicable

Change-Id: I39dc7eac6d9478797adf55a69b829578f4adc5eb
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>