multimedia/svt-vp9: back out r514290 per forced push upstream

https://github.com/OpenVisualCloud/SVT-VP9/issues/62

<phase: fetch >

> License BSD2CLAUSE+PATENT accepted by the user

> OpenVisualCloud-SVT-VP9-v0.1.1_GH0.tar.gz doesn't seem to exist in /portdistfiles/.

> Attempting to fetch

https://codeload.github.com/OpenVisualCloud/SVT-VP9/tar.gz/v0.1.1?dummy=/OpenVisualCloud-SVT-VP9-v0.1.1_GH0.tar.gz
fetch:
https://codeload.github.com/OpenVisualCloud/SVT-VP9/tar.gz/v0.1.1?dummy=/OpenVisualCloud-SVT-VP9-v0.1.1_GH0.tar.gz:
Not Found

> Attempting to fetch http://distcache.FreeBSD.org/ports-distfiles/OpenVisualCloud-SVT-VP9-v0.1.1_GH0.tar.gz

fetch: http://distcache.FreeBSD.org/ports-distfiles/OpenVisualCloud-SVT-VP9-v0.1.1_GH0.tar.gz: Not Found

> Couldn't fetch it - please try to retrieve this

> port manually into /portdistfiles/ and try again.

• Error code 1

Reported by: pkg-fallout