GUACAMOLE-217: FFmpeg's decoupled I/O functions were not available until libavcodec 57.37.100.
GUACAMOLE-217: FFmpeg's decoupled I/O functions were not available until libavcodec 57.37.100.

apache/guacamole-server,glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server,apache/guacamole-server,glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server,apache/guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server