[Merge] lp:~ricmm/platform-api/orientation-sensor into lp:platform-api

[Ricardo Mendoza]

> Thought we wanted to try to avoid float values as arguments, do we really want
> to land all these new functions with float arguments (over hybris)?

So whats broken on 4.8+ against 4.7 is the calling convention between systems with a VFP unit and soft FPUs. We moved away from floats by value because of this, instead relying on floats by reference which is clean of the ABI and should suppose a more resilient ABI against further compiler changes with 4.9 or 4.10.
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https://code.launchpad.net/~ricmm/platform-api/orientation-sensor/+merge/221025
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