MFH: r552564

emulators/{citra,yuzu}: update OSS patches

No actual changes this time. Only switching away from a deleted fork
merge commit to upstream master branch. The former may become invalid
in future (e.g., due to "git gc") and break build.

Changes: https://github.com/kinetiknz/cubeb/compare/40865a6..a7e83aa
Approved by: ports-secteam blanket (reliability fix)