Quarterly backport for multimedia/x265 patch

Hi all,

There's been a lot of packages that haven't been built in quarterly because of a checksum mismatch. I think this affected latest as well for a little while, but that's been resolved.

Here's some information on the extent of the issue: 
https://forums.freebsd.org/threads/disappearance-of-desktop-applications-firefox-thunderbird-from-repositories.94550/

And a bug for a quick fix: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280833

Moving forward, it sounds like this is not the first time this has happened. Something about the patch format coming back slightly differently from Bitbucket. Could we move the patch to the patches/ folder so this can't be an issue in the future, or could we update to x265 3.6, which doesn't need it?

Thank you!

-Henrich