Launch ffplay on video and audio MIME types in Orbital programs

See merge request redox-os/cookbook!384

Move ps2d invocation after the logging ramfs is created

See merge request redox-os/cookbook!383

Fix the xz recipe

See merge request redox-os/cookbook!382

This is necessary for ps2d to use redox-log.

Remove the TMPDIR env var

See merge request !381

It isn't set by default on Linux either and it makes the tempnam libc
function always create the temporary file in /tmp rather than prefer the
caller indicated location.

Move wget to the working recipes

See merge request !380