Bug#783082: video players crash with 'illegal instruction' on i586

[Bernhard Übelacker]

Hello Fabian, hello Sebastian,
as I tried to get a minimal example which shows this "impossible 
constraints" error I saw that a removal of a seemingly unrelated memset 
made the error go away.
Therefore I tried replacing this memset by a for loop and an assignment 
and that worked too. At least a package built in my i386-chroot compiled 
successfully and the package did not lead to a crash inside the 
i386-qemu-VM (not tested on real hardware).

So probably this could be a better workaround.

Attached you find for completeness all three changes, the first 2 are 
the same as the last time.

Kind regards,
Bernhard

PS.: If you think this is relevant to the upstream libav bug #850, could 
you please forward it?
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