Follow upstream switch to xz tarball:
78c492deaa
Removed dependency to libpthread-stubs, not needed anymore due to
upstream commit:
8f7e4c4e9f
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
