[x265] Issue #547: B-intra enabled for medium-preset (multicoreware/x265)

[The Stilt]

New issue 547: B-intra enabled for medium-preset
https://bitbucket.org/multicoreware/x265/issues/547/b-intra-enabled-for-medium-preset

The Stilt:

B-intra is currently enabled for medium, slower, veryslow and placebo preset. Based on the documentation \(preset options\), it should be only enabled on the three of the slowest presets. B-intra being disabled even on the slow-preset supports the assumption that this is not intentional.