package: add support for extracting zstd archives

Teach the generic package handling code how to extract zstd (.tar.zst)
archives. When zstd is not installed on the host, host-zstd gets built
automatically.

Signed-off-by: Matt Staveley-Taylor <matt.stav.taylor@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
5 files changed