package/lightning: bump version to 2.1.0

Removed autoreconf and both patches after upstream commits:
http://git.savannah.gnu.org/cgit/lightning.git/commit/configure.ac?id=e98640e1ac160034fe65346f68c5ade90d6b2032
http://git.savannah.gnu.org/cgit/lightning.git/commit/?id=361caf28545aa0c2b2ab8d1cbd334fbdd952f373



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>