Neon detection in configure does not work unless correct
flags are passed to compiler.
Task-number: QTBUG-44690
Change-Id: If119cc9ed80275aaa8796c1be8853559a7670d6a
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>