uhttpd: add hash
uhttpd had a hash file, but is says "none" because it is a git download.
Since our git downloads are not reproducible, we can actually add a
hash.
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Arnout Vandecappelle