Digging ARM, old gcc

[Aleix Pol]

Hi,
I've been pulling the thread on the QtWebEngine again now that 5.9 was
released and found a different issue:
https://bugreports.qt.io/browse/QTBUG-61846

In this bug report Kofler suggests that our gcc (6.2.0) may be having
an issue, do you know if we could maybe be shipping a newer one? I
don't see an advantage in having an old compiler.
I'm not sure which version fixes the issue, if you think it's worth it
I can figure it out.

Aleix