dleyna: switch to git clones instead of generated tarballs

The tarballs used were the dynamically-generated tarballs from github, which
recently have changed checksum.  Avoid this problem entirely by fetching from
git, locked to the relevant tag.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Acked-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>