[Bug 52423] Backport libtheora alpha7 (and dev package too)

[Onkar Shinde]

Public bug reported:

libtheora alpha7 has 'the new MMX asm is enabled by default'
I guess this improves performance and reduces CPU usage.

** Affects: dapper-backports (upstream)
     Importance: Untriaged
         Status: Unconfirmed

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Backport libtheora alpha7 (and dev package too)
https://launchpad.net/bugs/52423