libenca: bump version

Remove all the patches as they were accepted upstream.

[Thomas: drop AUTORECONF = YES, as suggested by Bernd.]

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Reviewed-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>