qt: add patch fixing build failure on ARMv8 in 32-bit mode

qt: add patch fixing build failure on ARMv8 in 32-bit mode

The Qt package currently fails to build on ARMv8 cores in 32-bit mode
(for example, if you select ARM and then Cortex-A53), because the ARM
atomic operation implementation in Qt checks if we're on ARMv7, then
on ARMv6, and otherwise falls back to an ARMv5 implementation. The
latter uses the swp instruction, which doesn't exist on ARMv8, causing
a build failure.

To solve this, we simply add a patch that uses the ARMv7 atomic
operations for ARMv8-A.

There is no autobuilder reference because we don't have any ARMv8
32-bit configuration in the autobuilders.

Cc: <ivychend@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>