[13] RFR: JDK-8215894: Provide media support for libav version 58

[Alexander Matveev]

Hi Kevin,

Please review the following:
https://bugs.openjdk.java.net/browse/JDK-8215894
http://cr.openjdk.java.net/~almatvee/8215894/webrev.00/

- Added support for libavcodec 58.

Thanks,
Alexander