Downloading the snapshot tarball has been unstable in the past so we
switch to git for fetching the source code.
Fixes:
https://autobuild.buildroot.net/results/8b9/8b9b15e578ee13c47bdfe77f8bd79cd34c49de91/
https://autobuild.buildroot.net/results/bfc/bfcfb6e5014e017334604ba8fdcfac2acc65d161/
https://autobuild.buildroot.net/results/6c6/6c69077ea076c3c28d0e8599913cde31ee27b0c5/
https://autobuild.buildroot.net/results/b43/b431fabedd709f660f556a7a6539a0b1e28aeb49/
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit d8b15b078a)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>