Bug#764732: gcc-4.9: broken -O2 optimizations on armhf

[peter green <plugwash@p10link.net>]

Matthias Klose wrote:
> there exist several workarounds for it (lowering the
> optimization, using gcc-4.8, ...). 
Disabling stack protector also seems to result in a succesful compile 
(reducing it from strong to regular does not).