[oe] opencv 3.1 gcc 6 compile errors

[Jack Mitchell]

I'm hitting compile errors with opencv 3.1 and gcc6. I've been playing 
with disabling/enabling different options to try get round the issues 
but it's too widespread.

There is a patch upstream [1] which says it fixes the issues but it 
doesn't seem to help.

I've attached the build log without the patch, and the build log with 
the patch, if anyone has ideas then please shout up.

Cheers,
Jack.

[1] 
https://github.com/Itseez/opencv/pull/6541/commits/a0fdc91a14f07de25d858037940fcd3ba859b4e2
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