lxc: bump to version 3.0.0

lxc: bump to version 3.0.0

- Remove both patches (applied upstream), and therefore remove
  AUTORECONF = YES.
- Remove --disable-python as python support has been removed
 (https://github.com/lxc/lxc/commit/e144a06bd792f99c96395a9d4c16cf7c656fb99d)
- Remove lua optional dependency as lua support has been removed
 (https://github.com/lxc/lxc/commit/b52a5bef6fa56481a6d817f4c73cb91ed012fe2c)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>