Their latest releases have still configured wrong submodule URLs,
so we need to use master here.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
The mingw32 build job often fails due frequent temporary problems on
cloning vom savannah. Retry several times, hoping to fix it.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>