Bug#1030890: libwebm: Provide additional headers to alllow building aom with the system libwebm

[Vasyl Gello <vasek.gello@gmail.com>]

Hi Vladimir,

Thanks for the patch!

I have not built it yet, but from the debdiff I see it only adds symbols, not removes them?
If yes, I think we can accept it. Removing symbols would need a transition which is no-go
at this stage of bookworm freeze.

-- 
Vasyl Gello

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호랑이는 죽어서 가죽을 남기고 사람은 죽어서 이름을 남긴다