Bug#738760: libav: Add proper raspberry pi CPU detection

[peter green]

Sebastian Ramacher wrote:
>> I've applied your patch, tweaked it to use --derives-from rather than --is
>> implemented this change, written a changelog entry (which may be more
>> verbose than actually needed, feel free to cut it down if you want when
>> bringing the change into Debian) and am now running a build. Assuming it
>> builds successfully and passes our contamination checker I will be uploading
>> it to raspbian jessie.
>>     
>
> Please let me know how the tests went.
>   
The package built successfully and passed the contamination checker. So
I uploaded it.

A debdiff for the new version ( 11.1-1+rpi1 ) should appear soon at
https://debdiffs.raspbian.org/main/liba/libav/

Note: I have not tested if the resulting packages actually work (I see
no reason to suspect they wouldn't though)