package/enlightenment: bump to version 0.19.12

Use the newly added libefl package wich provide a new version
of efl libraries.
This new version needs libelementary dependency.

Update upstream url, add hash file and use xz archive.

Select png and jpeg image loader since enlightenment_start
fail at runtime if png and jpeg image loader are not
available in elf libraries.

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>